The invention discloses a method and device for calibrating data traffic of a mobile terminal. A technical problem that the existing traffic monitoring software cannot provide accurate traffic use information for the user is solved. The method comprises the following steps: sending a traffic query request to an operator server according to a communication service type of the mobile terminal and a traffic query instruction corresponding to the communication service of this type; receiving a traffic query result returned by the operator server, and analyzing the traffic query result according to a preset analysis rule so as to acquire the traffic information contained therein; sending the traffic information to the mobile terminal so that the mobile terminal can calibrate the data traffic counted by the local equipment according to the traffic information.