diff --git a/backend/app/routers/collections.py b/backend/app/routers/collections.py
index cfad289..7fbf85a 100644
--- a/backend/app/routers/collections.py
+++ b/backend/app/routers/collections.py
@@ -67,11 +67,11 @@ def generate_code(version: str, user_id: str, db: Session) -> str:
     """自动生成藏品编号 - 按用户独立编码"""
     import re
     
-    # 查询当前用户的非空编码（不与其他用户混算）
+    # 查询当前用户的非空编码（不与其他用户混算）- 使用行锁防止并发
     user_codes = db.query(Collection.f01_02_code).filter(
         Collection.f01_02_code.isnot(None),
         Collection.f99_91_user_id == user_id
-    ).all()
+    ).with_for_update().all()
     
     max_num = 0
     for (code,) in user_codes: