The invention discloses an unlocking method for a mobile terminal. The unlocking method includes: a step S10, acquiring face data of a current user when it is recognized that an object to be measured is a human face according to a distance between the object to be measured and a screen of the mobile terminal; a step S20, determining if the face data of the current user is identical to preset face data of a preset user or not; executing a step S35 if so, otherwise, executing a step S36; the step S35, unlocking the mobile terminal; and the step S36, allowing the mobile terminal to be in a blank screen state. According to the method, the face data of the current user can be acquired according to the distance between the object to be measured and the screen of the mobile terminal; it is determined if the acquired face data and the preset face data are identical or not, and then the mobile terminal is unlocked; and the unlocking method is high in safety, is high in novelty, and can meet the demands of a user experience.