diff --git a/src/main/java/com/genersoft/iot/vmp/streamProxy/service/impl/StreamProxyServiceImpl.java b/src/main/java/com/genersoft/iot/vmp/streamProxy/service/impl/StreamProxyServiceImpl.java
index a37b4b471..c36daf78c 100755
--- a/src/main/java/com/genersoft/iot/vmp/streamProxy/service/impl/StreamProxyServiceImpl.java
+++ b/src/main/java/com/genersoft/iot/vmp/streamProxy/service/impl/StreamProxyServiceImpl.java
@@ -235,6 +235,18 @@ public class StreamProxyServiceImpl implements IStreamProxyService {
         if (streamProxyInDb == null) {
             throw new ControllerException(ErrorCode.ERROR100.getCode(), "代理不存在");
         }
+
+        // 检查 app+stream 唯一性（如果修改了app或stream）
+        if (!streamProxyInDb.getApp().equals(streamProxy.getApp()) ||
+            !streamProxyInDb.getStream().equals(streamProxy.getStream())) {
+            StreamProxy duplicate = streamProxyMapper.selectOneByAppAndStream(
+                streamProxy.getApp(), streamProxy.getStream());
+            if (duplicate != null && !duplicate.getId().equals(streamProxy.getId())) {
+                throw new ControllerException(ErrorCode.ERROR100.getCode(),
+                    "应用名 [" + streamProxy.getApp() + "] 下的流ID [" + streamProxy.getStream() + "] 已存在");
+            }
+        }
+
         int updateResult = streamProxyMapper.update(streamProxy);
         if (updateResult > 0 && !ObjectUtils.isEmpty(streamProxy.getGbDeviceId())) {
             if (streamProxy.getGbId() > 0) {