Taking welding projects of various axle housing products as examples, the typical design ideas and application examples of the three-axis inverted positioner used in the robot welding workstation are summarized,including the main structure design,technical parameters,working principle of the three-axis inverted positioner. The working principle and function realization of the three-axis inverted positioner,which is the core equipment of the whole welding workstation,are mainly analyzed. It has been proved by practice that the welding effect is good,the automation degree is high, the manual operation is flexible and convenient,which ensures the welding quality of axle housing and meets the welding requirements. It provides an important reference for the follow-up project.