In recent years, laser coding has been more and more used in PCB printing. In order to improve the yield and product quality of electronic products, circuit board manufacturers have used laser coding equipment to automatically generate two-dimensional codes on the circuit board from the raw material procurement, production process and process, product batch, manufacturer, production date, product destination and other information. The two-dimensional codes are automatically marked on the surface of PCB/FPCB by laser to realize the control and traceability of product quality.