diff --git a/apps/iot/src/iot_device_sup.erl b/apps/iot/src/iot_device_sup.erl
index 9b9d26d..bab1393 100644
--- a/apps/iot/src/iot_device_sup.erl
+++ b/apps/iot/src/iot_device_sup.erl
@@ -25,6 +25,9 @@ init([]) ->
 ensured_device_started(DeviceUUID) when is_binary(DeviceUUID) ->
     case iot_device:get_pid(DeviceUUID) of
         undefined ->
+            %% 先删除，然后添加
+            Id = iot_device:get_name(DeviceUUID),
+            supervisor:delete_child(?MODULE, Id),
             case supervisor:start_child(?MODULE, child_spec(DeviceUUID)) of
                 {ok, Pid} when is_pid(Pid) ->
                     {ok, Pid};