The invention discloses a plug-in type drive mode switching method. According to the method, the location and running direction of a vehicle are recognized by automatically collecting road spectrum information of running lines, and after on-site calibration is performed in road sections in which an electric-only mode is needed, the vehicle can enter or exit the electric-only mode automatically according to the GPS geographical position, so that the technical problem that currently, in the running process of a plug-in type hybrid power vehicle in the prior art, a driver needs to manually switch between the electric-only mode and a hybrid power mode is solved, and energy-saving control over the plug-in type hybrid power vehicle is achieved indirectly.