The anti-theft device is installed in one vehicle body, which has rotating wheel shaft and at least one wheel with one defined air storing space. The anti-theft device has one controlled wheel deflating unit and one main control unit. The controlled wheel deflating unit has one air controlling assembly connected to the wheel and capable of being driven to switch from air maintaining state to air deflating state. The main control unit mounted on the vehicle body includes one main control circuit capable of sensing the motion of vehicle body to drive the air controlling assembly. In case of stolen vehicle, the air inside the wheel will be deflated and the vehicle can not be run. |