The invention discloses an auxiliary parking device and an auxiliary parking method thereof, comprising a camera, a radar detector, a strip-shaped floor lamp, a pressure sensor A, a pressure sensor B, a laser emitter, and an ECU. The camera is used to take pictures of vehicles looking for parking spaces in the passage. The radar detector is used to detect whether there is a vehicle parked in the parking space. The strip-shaped ground lights are used to guide the driver to find an appropriate parking space, and serve as the starting line for parking and storage, perpendicular to the longitudinal direction of the passage, and correspond to the parking spaces one by one. Pressure sensor A and pressure sensor B are respectively installed under the ground on the left and right sides behind the strip floor lamp, and are used to detect the pressure of the front wheels on the left and right sides of the vehicle on the ground. The laser transmitter is installed at the front end of the parking line on the left and right sides of the parking space, and emits light beams forward along the parking lines on both sides of the parking space. The ECU receives the detection information sent by the camera, radar detector, pressure sensor A, and pressure sensor B, and uses it as a judgment basis to assist in controlling the vehicle to complete parking.