diff --git a/apps/iot/src/iot_logger.erl b/apps/iot/src/iot_logger.erl
index 72a4691..9ffda21 100644
--- a/apps/iot/src/iot_logger.erl
+++ b/apps/iot/src/iot_logger.erl
@@ -136,6 +136,18 @@ flush(State = #state{file = OldFile, file_name = FileName, date = Date, buffer =
             {ok, File} = file:open(FilePath, [append, binary]),
 
             ok = file:write(File, Content),
+
+            %% 清理历史的文件, 日志文件保留一个月的
+            OldFiles = list_old_files(FileName, 30),
+            [begin
+                 case filelib:is_file(FilePath) of
+                     true ->
+                         file:delete(FilePath);
+                     false ->
+                         ok
+                 end
+             end || FilePath <- OldFiles],
+
             State#state{file = File, buffer = [], date = get_date()};
         false ->
             ok = file:write(OldFile, Content),
@@ -153,7 +165,10 @@ time_prefix() ->
 
 -spec make_file(LogFile :: string()) -> string().
 make_file(LogFile) when is_list(LogFile) ->
-    {Year, Month, Day} = erlang:date(),
+    Date = erlang:date(),
+    make_file(LogFile, Date).
+
+make_file(LogFile, {Year, Month, Day}) when is_list(LogFile) ->
     Suffix = io_lib:format("~b~2..0b~2..0b", [Year, Month, Day]),
     RootDir = code:root_dir() ++ "/log/",
     lists:flatten(RootDir ++ LogFile ++ "." ++ Suffix).
@@ -177,4 +192,13 @@ get_date() ->
 -spec maybe_new_file(Date :: calendar:date()) -> boolean().
 maybe_new_file({Y, M, D}) ->
     {{Y0, M0, D0}, _} = calendar:local_time(),
-    not (Y =:= Y0 andalso M =:= M0 andalso D =:= D0).
\ No newline at end of file
+    not (Y =:= Y0 andalso M =:= M0 andalso D =:= D0).
+
+-spec list_old_files(LogFile :: string(), Days :: integer()) -> [string()].
+list_old_files(LogFile, Days) when is_list(LogFile), is_integer(Days) ->
+    Seconds0 = calendar:datetime_to_gregorian_seconds(calendar:local_time()),
+    Seconds = Seconds0 - Days * 86400,
+    lists:map(fun(Day) ->
+        {Date, _} = calendar:gregorian_seconds_to_datetime(Seconds - Day * 86400),
+        make_file(LogFile, Date)
+              end, lists:seq(1, 10)).
\ No newline at end of file