This invention provides a mobile communication terminal and a message automatic cleaning method thereof. The mobile communication terminal comprises a user interface unit, a man machine interface and a message module interface, a cleaning management unit, a timing trigger unit and a rule judgment unit. The message automatic cleaning method of the mobile communication terminal comprises the following steps: step a, setting message directory automatic cleaning frequencies and rules in a rule judgment unit; step b, setting a waiting period of a timing trigger unit; step c, judging whether current information accords with the cleaning rule when the set waiting period ends, and deleting the message if the information accords with the rule. With the mobile communication terminal and the message automatic cleaning method thereof provided in the present invention, messages can be automatically deleted in accordance with the time and manner set by the user, so insufficiency of memory space caused by the messages being not cleaned by the user for a long time is avoided. Hence, it facilitates the user.