Abstract: The automatic welding system was designed for the platen of automobile clutch. The system consists of fixture mechanism, pulled positioning and rotating structure, laser welding mechanism. The center hole of the base was used as positioning center, and on two sides of the bearing seat was equipped with two sets of spring latch mechanism in the fixture, which of that made sure of that fixture do not turn after the rotation mechanism. The power supply provided by that servo motor drive the reducer, and then through the positioning pin of the reducer shaft end table pass the driving force to the product.