The invention discloses an antitheft method and a mobile terminal. The mobile terminal comprises at least one camera. The antitheft method comprises: S1, determining whether the mobile terminal is in a lost state, if yes, calling at least one camera at a background to photograph an image and if not, ending the flows; and S2, transmitting the image to a preset address at the background by using the mobile terminal. The antitheft method may increase the probability of retrieving a lost cell phone by a user and reduce loss of the user. Further, the antitheft method may accurately acquire image data and positional information and improve a probability of acquiring effective data by the user.