diff --git a/apps/emqx/src/emqx_map_lib.erl b/apps/emqx/src/emqx_map_lib.erl
index c714d7dbc..b01391c7b 100644
--- a/apps/emqx/src/emqx_map_lib.erl
+++ b/apps/emqx/src/emqx_map_lib.erl
@@ -23,6 +23,7 @@
     deep_force_put/3,
     deep_remove/2,
     deep_merge/2,
+    binary_key_map/1,
     safe_atom_key_map/1,
     unsafe_atom_key_map/1,
     jsonable_map/1,
@@ -153,6 +154,17 @@ deep_convert(Val, _, _Args) ->
 unsafe_atom_key_map(Map) ->
     covert_keys_to_atom(Map, fun(K) -> binary_to_atom(K, utf8) end).
 
+-spec binary_key_map(map()) -> map().
+binary_key_map(Map) ->
+    deep_convert(
+        Map,
+        fun
+            (K, V) when is_atom(K) -> {atom_to_binary(K, utf8), V};
+            (K, V) when is_binary(K) -> {K, V}
+        end,
+        []
+    ).
+
 -spec safe_atom_key_map(#{binary() | atom() => any()}) -> #{atom() => any()}.
 safe_atom_key_map(Map) ->
     covert_keys_to_atom(Map, fun(K) -> binary_to_existing_atom(K, utf8) end).