Method and device for unlocking mobile terminal screen and mobile terminal comprising device

The invention provides a method and a device for unlocking a mobile terminal screen and a mobile terminal comprising the device. The method comprises the following steps of: starting a first unlocking interface; receiving first unlocking operation of a user to the mobile terminal screen; judging whether the first unlocking operation corresponds to first predetermined unlocking operation; if the first unlocking operation corresponds to the first predetermined unlocking operation, unlocking the mobile terminal screen; if the first unlocking operation does not correspond to the first predetermined unlocking operation, starting a second unlocking interface; receiving second unlocking operation of the user; judging whether the second unlocking operation corresponds to second predetermined unlocking operation; and if the second unlocking operation corresponds to the second predetermined unlocking operation, unlocking the mobile terminal screen, wherein the complexity of the first predetermined unlocking operation is lower than that of the second predetermined unlocking operation. By the method and the device, two unlocking modes are combined into a two-stage nested form, so that user information security is ensured, operation steps are simplified simultaneously, and user experience is improved.