diff --git a/crates/erp-ai/src/service/knowledge_v2.rs b/crates/erp-ai/src/service/knowledge_v2.rs
new file mode 100644
index 0000000..781bf68
--- /dev/null
+++ b/crates/erp-ai/src/service/knowledge_v2.rs
@@ -0,0 +1,258 @@
+use sea_orm::{
+    ColumnTrait, ConnectionTrait, EntityTrait, PaginatorTrait, QueryFilter, QueryOrder, Set,
+};
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+use crate::entity::ai_knowledge_bases;
+use crate::error::{AiError, AiResult};
+
+// ─── DTO ───
+
+#[derive(Debug, Deserialize, Serialize, utoipa::ToSchema)]
+pub struct CreateKnowledgeBaseReq {
+    pub name: String,
+    pub kb_type: String,
+    pub description: Option<String>,
+    pub icon: Option<String>,
+    pub chunk_strategy: Option<serde_json::Value>,
+    pub intent_keywords: Option<serde_json::Value>,
+    pub embedding_model: Option<String>,
+    pub is_enabled: Option<bool>,
+}
+
+#[derive(Debug, Deserialize, Serialize, utoipa::ToSchema)]
+pub struct UpdateKnowledgeBaseReq {
+    pub name: Option<String>,
+    pub kb_type: Option<String>,
+    pub description: Option<String>,
+    pub icon: Option<String>,
+    pub chunk_strategy: Option<serde_json::Value>,
+    pub intent_keywords: Option<serde_json::Value>,
+    pub embedding_model: Option<String>,
+    pub is_enabled: Option<bool>,
+}
+
+#[derive(Debug, Deserialize, utoipa::IntoParams)]
+pub struct ListKnowledgeBasesQuery {
+    pub kb_type: Option<String>,
+    pub is_enabled: Option<bool>,
+    pub page: Option<u64>,
+    pub page_size: Option<u64>,
+}
+
+// ─── Service ───
+
+pub struct KnowledgeV2Service {
+    db: sea_orm::DatabaseConnection,
+}
+
+impl KnowledgeV2Service {
+    pub fn new(db: sea_orm::DatabaseConnection) -> Self {
+        Self { db }
+    }
+
+    pub async fn list(
+        &self,
+        tenant_id: Uuid,
+        query: &ListKnowledgeBasesQuery,
+    ) -> AiResult<(Vec<ai_knowledge_bases::Model>, u64)> {
+        let page = query.page.unwrap_or(1);
+        let page_size = query.page_size.unwrap_or(20);
+
+        let mut find = ai_knowledge_bases::Entity::find()
+            .filter(ai_knowledge_bases::Column::TenantId.eq(tenant_id))
+            .filter(ai_knowledge_bases::Column::DeletedAt.is_null());
+
+        if let Some(ref kb_type) = query.kb_type {
+            find = find.filter(ai_knowledge_bases::Column::KbType.eq(kb_type.as_str()));
+        }
+        if let Some(is_enabled) = query.is_enabled {
+            find = find.filter(ai_knowledge_bases::Column::IsEnabled.eq(is_enabled));
+        }
+
+        let paginator = find
+            .order_by_desc(ai_knowledge_bases::Column::CreatedAt)
+            .paginate(&self.db, page_size);
+
+        let total = paginator.num_items().await?;
+        let items = paginator.fetch_page(page - 1).await?;
+
+        Ok((items, total))
+    }
+
+    pub async fn get_by_id(
+        &self,
+        tenant_id: Uuid,
+        id: Uuid,
+    ) -> AiResult<ai_knowledge_bases::Model> {
+        ai_knowledge_bases::Entity::find_by_id(id)
+            .one(&self.db)
+            .await
+            .map_err(|e| AiError::DbError(e.to_string()))?
+            .filter(|m| m.tenant_id == tenant_id && m.deleted_at.is_none())
+            .ok_or_else(|| AiError::KnowledgeError("知识库不存在".into()))
+    }
+
+    pub async fn create(
+        &self,
+        tenant_id: Uuid,
+        user_id: Uuid,
+        req: CreateKnowledgeBaseReq,
+    ) -> AiResult<Uuid> {
+        let id = Uuid::now_v7();
+        let now = chrono::Utc::now();
+
+        let active = ai_knowledge_bases::ActiveModel {
+            id: Set(id),
+            tenant_id: Set(tenant_id),
+            name: Set(req.name),
+            kb_type: Set(req.kb_type),
+            description: Set(req.description),
+            icon: Set(req.icon),
+            chunk_strategy: Set(req.chunk_strategy.unwrap_or(
+                serde_json::json!({"strategy": "auto", "chunk_size": 500, "overlap": 50}),
+            )),
+            intent_keywords: Set(req.intent_keywords.unwrap_or(serde_json::json!([]))),
+            embedding_model: Set(req.embedding_model),
+            is_enabled: Set(req.is_enabled.unwrap_or(true)),
+            document_count: Set(0),
+            chunk_count: Set(0),
+            created_at: Set(now),
+            updated_at: Set(now),
+            created_by: Set(Some(user_id)),
+            updated_by: Set(Some(user_id)),
+            deleted_at: Set(None),
+            version_lock: Set(1),
+        };
+
+        ai_knowledge_bases::Entity::insert(active)
+            .exec(&self.db)
+            .await
+            .map_err(|e| AiError::DbError(e.to_string()))?;
+
+        Ok(id)
+    }
+
+    pub async fn update(
+        &self,
+        tenant_id: Uuid,
+        user_id: Uuid,
+        id: Uuid,
+        req: UpdateKnowledgeBaseReq,
+    ) -> AiResult<()> {
+        let existing = self.get_by_id(tenant_id, id).await?;
+        let now = chrono::Utc::now();
+
+        let active = ai_knowledge_bases::ActiveModel {
+            id: Set(existing.id),
+            tenant_id: Set(existing.tenant_id),
+            name: Set(req.name.unwrap_or(existing.name)),
+            kb_type: Set(req.kb_type.unwrap_or(existing.kb_type)),
+            description: Set(req.description.or(existing.description)),
+            icon: Set(req.icon.or(existing.icon)),
+            chunk_strategy: Set(req.chunk_strategy.unwrap_or(existing.chunk_strategy)),
+            intent_keywords: Set(req.intent_keywords.unwrap_or(existing.intent_keywords)),
+            embedding_model: Set(req.embedding_model.or(existing.embedding_model)),
+            is_enabled: Set(req.is_enabled.unwrap_or(existing.is_enabled)),
+            document_count: Set(existing.document_count),
+            chunk_count: Set(existing.chunk_count),
+            created_at: Set(existing.created_at),
+            updated_at: Set(now),
+            created_by: Set(existing.created_by),
+            updated_by: Set(Some(user_id)),
+            deleted_at: Set(existing.deleted_at),
+            version_lock: Set(existing.version_lock + 1),
+        };
+
+        ai_knowledge_bases::Entity::update(active)
+            .exec(&self.db)
+            .await
+            .map_err(|e| AiError::DbError(e.to_string()))?;
+
+        Ok(())
+    }
+
+    pub async fn delete(&self, tenant_id: Uuid, id: Uuid) -> AiResult<()> {
+        let existing = self.get_by_id(tenant_id, id).await?;
+        let now = chrono::Utc::now();
+
+        let active = ai_knowledge_bases::ActiveModel {
+            id: Set(existing.id),
+            tenant_id: Set(existing.tenant_id),
+            name: Set(existing.name),
+            kb_type: Set(existing.kb_type),
+            description: Set(existing.description),
+            icon: Set(existing.icon),
+            chunk_strategy: Set(existing.chunk_strategy),
+            intent_keywords: Set(existing.intent_keywords),
+            embedding_model: Set(existing.embedding_model),
+            is_enabled: Set(existing.is_enabled),
+            document_count: Set(existing.document_count),
+            chunk_count: Set(existing.chunk_count),
+            created_at: Set(existing.created_at),
+            updated_at: Set(now),
+            created_by: Set(existing.created_by),
+            updated_by: Set(existing.updated_by),
+            deleted_at: Set(Some(now)),
+            version_lock: Set(existing.version_lock + 1),
+        };
+
+        ai_knowledge_bases::Entity::update(active)
+            .exec(&self.db)
+            .await
+            .map_err(|e| AiError::DbError(e.to_string()))?;
+
+        Ok(())
+    }
+
+    /// 原子递增文档计数（用于文档上传成功后）
+    pub async fn increment_document_count(&self, kb_id: Uuid, delta: i32) -> AiResult<()> {
+        let sql = r#"
+            UPDATE ai_knowledge_bases
+            SET document_count = document_count + $2,
+                updated_at = $3,
+                version_lock = version_lock + 1
+            WHERE id = $1 AND deleted_at IS NULL
+        "#;
+        let stmt = sea_orm::Statement::from_sql_and_values(
+            sea_orm::DatabaseBackend::Postgres,
+            sql,
+            [
+                sea_orm::Value::from(kb_id),
+                sea_orm::Value::from(delta),
+                sea_orm::Value::from(chrono::Utc::now()),
+            ],
+        );
+        self.db
+            .execute(stmt)
+            .await
+            .map_err(|e| AiError::DbError(e.to_string()))?;
+        Ok(())
+    }
+
+    /// 原子递增切片计数（用于切片生成后）
+    pub async fn increment_chunk_count(&self, kb_id: Uuid, delta: i32) -> AiResult<()> {
+        let sql = r#"
+            UPDATE ai_knowledge_bases
+            SET chunk_count = chunk_count + $2,
+                updated_at = $3,
+                version_lock = version_lock + 1
+            WHERE id = $1 AND deleted_at IS NULL
+        "#;
+        let stmt = sea_orm::Statement::from_sql_and_values(
+            sea_orm::DatabaseBackend::Postgres,
+            sql,
+            [
+                sea_orm::Value::from(kb_id),
+                sea_orm::Value::from(delta),
+                sea_orm::Value::from(chrono::Utc::now()),
+            ],
+        );
+        self.db
+            .execute(stmt)
+            .await
+            .map_err(|e| AiError::DbError(e.to_string()))?;
+        Ok(())
+    }
+}
diff --git a/crates/erp-ai/src/service/mod.rs b/crates/erp-ai/src/service/mod.rs
index a051225..c192f76 100644
--- a/crates/erp-ai/src/service/mod.rs
+++ b/crates/erp-ai/src/service/mod.rs
@@ -11,6 +11,7 @@ pub mod embedding;
 pub mod feature_flag_service;
 pub mod insight_service;
 pub mod knowledge;
+pub mod knowledge_v2;
 pub mod local_rules;
 pub mod output_parser;
 pub mod post_process;