The present disclosure provides an automatic positioning system that is in a mobile device. The mobile device communicates with a vehicle. The system includes a first detection module, a second detection module and a positioning module. The first detection module detects the mobile device is in a moving state or a static state in real-time. The second detection module detects the vehicle is in a moving state or a static state in real-time. The positioning module acquires the location of the mobile device and records the acquired location as a position where the vehicle is parked in the mobile device, when the vehicle changes from the moving state to the static state, the mobile device changes from the static state to the moving state.