The front vehicle collision warning detects the area in front of the vehicle through the camera, analyzes and calculates the image, and monitors the vehicle in front. When the vehicle speed exceeds20km / h, automatically judge the distance between the vehicle and the preceding vehicle, and make different responses according to different distances based on the comprehensive speed information; No warning within the safe distance; High frequency warning within dangerous distance. Voice prompt is adopted to help the driver avoid or slow down the collision accident.