The invention belongs to the technical field of machine vision, and particularly relates to a machine vision testing system. The system comprises a video camera. The output end of the video camera iselectrically connected with the input end of an image acquisition card. The output end of the image processing module is electrically connected with the input end of an industrial computer. The inputend of the industrial computer is electrically connected with the output ends of a light strength sensor and a picture acquisition module. The input end of the picture acquisition module is electrically connected with the output end of a picture memory. The output end of the industrial computer is connected with the input ends of an output testing module, a alight supplementing module and a control module. The output end of the control module is electrically connected with the input end of an executing module. Through image acquisition and accurate processing, testing precision and testing speed are improved, and industrial production quality and production efficiency are greatly improved. Furthermore high convenience in use and low fabrication cost are realized.