diff --git a/vue-fastapi-backend/module_admin/dao/data_ast_content_dao.py b/vue-fastapi-backend/module_admin/dao/data_ast_content_dao.py
index 423d591..f05f0f3 100644
--- a/vue-fastapi-backend/module_admin/dao/data_ast_content_dao.py
+++ b/vue-fastapi-backend/module_admin/dao/data_ast_content_dao.py
@@ -9,6 +9,7 @@ from module_admin.entity.do.user_do import SysUser
 from module_admin.entity.vo.data_ast_content_vo import DataCatalogPageQueryModel, DeleteDataCatalogModel,DataCatalogChild,DataAstBookmarkRelaRequest,DataAstIndxRequest,DataAstIndxResponse
 from utils.page_util import PageUtil
 from utils.log_util import logger
+from exceptions.exception import ServiceException
 
 
 class DataCatalogDAO:
@@ -176,7 +177,33 @@ class DataCatalogDAO:
         )
         return data_ast_list
 
-
+    @classmethod
+    async def check_duplicate_catalog(cls, db: AsyncSession, catalog1: dict, exclude_content_onum: int = None):
+        """
+        校验同一父节点下是否已存在相同名称的目录（可排除指定 content_onum）
+    
+        :param db: ORM 对象
+        :param catalog1: 主目录对象（DataAstContent）
+        :param exclude_content_onum: 可选，编辑时排除自己
+        :return: 如果存在重复目录，抛出 ServiceException
+        """
+        query = select(DataAstContent).where(
+            and_(
+                DataAstContent.supr_content_onum == catalog1.get("supr_content_onum"),
+                DataAstContent.content_name == catalog1.get("content_name")
+            )
+        )
+    
+        if exclude_content_onum:
+            query = query.where(DataAstContent.content_onum != exclude_content_onum)
+    
+        result = await db.execute(query)
+        exist_catalog = result.scalars().first()
+        if exist_catalog:
+            raise ServiceException(
+                message=f"同一父节点下已存在名称为“{catalog1.get('content_name')}”的目录"
+            )
+    
     @classmethod
     async def add_catalog_dao(cls, db: AsyncSession, catalog1: dict, catalog2: dict):
         """
diff --git a/vue-fastapi-backend/module_admin/service/data_ast_content_service.py b/vue-fastapi-backend/module_admin/service/data_ast_content_service.py
index c102a84..c7d4282 100644
--- a/vue-fastapi-backend/module_admin/service/data_ast_content_service.py
+++ b/vue-fastapi-backend/module_admin/service/data_ast_content_service.py
@@ -156,10 +156,14 @@ class DataCatalogService:
                 child["rela_eff_end_date"] = datetime(year=2999, month=12, day=31, hour=0, minute=0, second=0).strftime("%Y-%m-%d %H:%M:%S"), # 设置默认值，2999-12-31
                 child["upd_prsn"] = request.upd_prsn,
                 child["rela_status"] = "1"
-            
+            await DataCatalogDAO.check_duplicate_catalog(query_db, catalog_data1)
             new_catalog = await DataCatalogDAO.add_catalog_dao(query_db, catalog_data1, catalog_data2)
             await query_db.commit()
             return CrudResponseModel(is_success=True, message='新增成功', data=new_catalog)
+        except ServiceException as e:
+            await query_db.rollback()
+            # 直接抛出，不再重新包装，保留 DAO 层信息
+            raise e
         except Exception as e:
             await query_db.rollback()
             raise ServiceException(message=f"创建目录时发生错误: {str(e)}")
@@ -224,9 +228,14 @@ class DataCatalogService:
                 
                 child["upd_prsn"] = request.upd_prsn
                 child["rela_status"] = "1"
+            await DataCatalogDAO.check_duplicate_catalog(query_db, catalog_data, exclude_content_onum=request.content_onum)
             await DataCatalogDAO.edit_catalog_child_dao(query_db, catalog_data)
             await query_db.commit()
             return CrudResponseModel(is_success=True, message='更新成功')
+        except ServiceException as e:
+            await query_db.rollback()
+            # 直接抛出，不再重新包装，保留 DAO 层信息
+            raise e        
         except Exception as e:
             await query_db.rollback()
             raise ServiceException(message=f"更新目录时发生错误: {str(e)}")