The present invention provides a method for automatically responding to mobile phone short messages, comprising the following steps: step a, set a short message auto responding number and auto responding content; step b, when receiving a new message, judge whether the sender number of the new message needs an auto response; step c, if the number needs an auto response, respond the auto responding message to the sender of the short message. The method for automatically responding to mobile phone short messages provided in the invention can auto respond short messages to one or some phone numbers according to the requirement of a user, and can input auto responding content according to the requirement of the user, thus greatly helping the user respond a short message in time on special occasions.