In the PCB printed circuit manufacturing, the printed circuit connection line needs to be checked. This inspection relies primarily on the employee's visual inspection of the eye before using machine vision inspection. However, manual testing has many drawbacks. The PCB circuit is complicated and small. Due to irresistible factors such as human eye fatigue, not only some defective products will be missed. Moreover, long-term inspections affect the vision of employees, resulting in the loss of secondary workstations. This problem is also a major problem that plagues many enterprises.