The new energy battery box online visual inspection system is mainly composed of high-precision laser sensors, precise linear motion modules, and positioning fixtures. It is mainly a new generation of non-contact visual inspection products developed to solve the problems of welding slag, welding bead detection accuracy, low efficiency, and difficult data traceability of new energy vehicle parts and components. This system has been successfully implemented in a number of production workshops for new energy vehicle parts assembly products. The system can realize the automation, online, informatization and digitization of product welding bead and welding slag detection.