The invention discloses an underground garage intelligent parking system and a control method. The underground garage intelligent parking system comprises a central treatment unit, a video capture device, a memorizer, a first motor and a second motor, wherein the first motor is used for driving a flatbed trolley, and the second motor is used for controlling a gate. The central treatment unit is simultaneously connected with the video capture device, the memorizer, the first motor and the second motor. The flatbed trolley is provided with a position clamping device used for fixing a vehicle. The flatbed trolley is arranged on a rail. The rail is arranged on the ground of an underground garage. The video capture device is arranged near the gate. According to the underground garage intelligent parking system and the control method, after the vehicle enter the underground garage, the vehicle only needs to drive on the flatbed trolley, then the vehicle is placed in a selected parking space through the flatbed trolley, in the whole process, a driver does not need to find the parking space, parking work is completed automatically by the underground garage intelligent parking system, the parking efficiency is improved greatly, the time of the diver is shortened, and the utilization ratio of the underground garage is improved.