Visual inspection system is a software system that replaces manual detection of barcode characters, cracks, packaging, surface layer integrity, depression, etc. The system is composed of industrial camera, industrial lens, visual inspection light source, controller and vision pro (a design module provided by national instruments for vision development). It can effectively improve the detection speed and accuracy of production line, greatly improve the output and quality, reduce labor costs, and prevent misjudgment caused by human eye fatigue.