The invention discloses a vehicle part detection method based on vehicle feature points and a system. The method comprises steps of acquiring a vehicle image and extracting vehicle features of vehicle parts and candidate regions of the vehicle parts; when the distance between the center of the candidate regions and the vehicle feature points is smaller than a threshold value, obtaining an area of interest of the vehicle parts; and extracting a target region of the vehicle parts in the area of interest. According to the invention, the area of interest is selected based on the vehicle feature points of the vehicle parts, so redundancy of the area of interest can be reduced and quality of the area of interest is improved, so the target region of the vehicle parts is obtained. Thus, the final vehicle part detection performance and accuracy are improved and the accuracy and the stability under conditions of illuminance change and noise pollution are also high.