diff --git a/etc/emqx.conf b/etc/emqx.conf
index 8e76a96a7..d3a1e7a67 100644
--- a/etc/emqx.conf
+++ b/etc/emqx.conf
@@ -446,7 +446,7 @@ log.file = emqx.log
 
 ## Log to single line
 ## Value: boolean
-#log.single_line = true
+#log.single_line = false
 
 ## Enables the log rotation.
 ## With this enabled, new log files will be created when the current
diff --git a/priv/emqx.schema b/priv/emqx.schema
index a6cfa3fc6..8de76a31a 100644
--- a/priv/emqx.schema
+++ b/priv/emqx.schema
@@ -487,7 +487,7 @@ end}.
 
 %% @doc format logs in a single line.
 {mapping, "log.single_line", "kernel.logger", [
-  {default, true},
+  {default, false},
   {datatype, {enum, [true, false]}}
 ]}.
 
diff --git a/src/emqx_tracer.erl b/src/emqx_tracer.erl
index 4e34ed79f..995712f6c 100644
--- a/src/emqx_tracer.erl
+++ b/src/emqx_tracer.erl
@@ -42,7 +42,7 @@
                               [peername, " "],
                               []}]},
                        msg, "\n"],
-                    single_line => true
+                    single_line => false
                    }}).
 -define(TOPIC_TRACE_ID(T), "trace_topic_"++T).
 -define(CLIENT_TRACE_ID(C), "trace_clientid_"++C).