The present invention proposes a single-chip microcomputer-based automobile gesture control device and its control method. The present invention uses a single-chip microcomputer as the main control unit, uses an infrared supplementary light to project infrared light, and uses a monocular camera with an infrared filter to capture user gestures. The image is sent to the single-chip microcomputer module. The single-chip microcomputer module analyzes, processes and recognizes the user gesture image, and controls the equipment control module to operate the vehicle equipment, thereby realizing the gesture control of the vehicle equipment. The single-chip microcomputer module of the present invention has excellent expansibility, and can be connected with different device drive modules according to actual needs to drive different automobile devices, so as to achieve the purpose of using gestures to control various in-vehicle devices. At the same time, the present invention uses an infrared supplementary light device with a monocular camera, which can be used under low-illumination conditions, and is more suitable for use in cars, especially when driving at night without daylight illumination, it can still be used normally.