Aiming at the complex structural parts of aerospace aluminum alloy,he research on the integration and application of automatic welding system based on laser sensing robot was carried out. The real-time perception and adaptive ability of robotic automatic welding system for complex structures were improved by integrating intelligent laser sensing. The intelligent laser sensor is used to collect and analyze the geometric information of welding groove,and the automatic tracking of welding seam track in the automatic welding process of the robot is realized through the algorithm compensation calculation,and the complex path tracking of 0.2～10 mm gap and 0.1～3 mm staggered edge is realized,as well as the adaptive tracking adjustment of 1 ～4 mm gradual gap,the weld is uniformly penetrated and formed.