The invention discloses a parking spot lock, which belongs to a vehicle parking assisting device and is used for solving the problem that certain parking spots are illegally occupied by other vehicles. The parking spot lock consists of a parking spot frame, a transverse rod, a solar panel, a motor, a controller and a base, wherein the upper part of the base is provided with the parking spot frame and the motor; the transverse rod at the bottom end of the parking spot frame is connected with a motor revolving shaft; the upper part of the motor is connected with the solar panel; the front side face of the motor is provided with the controller; the controller is electrically connected with the motor and the solar panel; and the controller is matched with a remote controller. When a vehicle is driven into a parking spot for parking, the remote controller carried along with the vehicle is pressed, the controller receives a remote control command, the motor starts to work, and the transverse rod at the bottom end of the vertical parking spot frame rotates towards the ground and is flush with the base, so that the vehicle can be driven into the parking spot; and when the vehicle is driven out of the parking spot, the parking spot frame is rotated and erected likewise by using the remote controller, so that other vehicles are prevented from parking illegally. Due to the adoption of the parking spot lock, the parking time can be saved, and reasonable use of the parking spot can be ensured.