Abstract: In order to solve the problems of technology, production quality and production efficiency caused by the heavy reliance on traditional manual processing of T profile in the field of shipbuilding, the rack-rail automatic welding equipmentthe was designed and analyzed. It provided a equipment to realize batch and continuous welding in the field of automatic welding technology, which can still meet the work requirements under harsh conditions,and realize multiple types of welding. The automatic welding function of the route can be quickly assembled and connected, and has the characteristics of free from manual handling, stable installation and flexible movement. The global and limited working space analysis of the fitting condition has been completed, and the equipment has achieved good production results in practical application. According to different working conditions and technical requirements, the equipment can be selected or its basic unit functions can be further customized and developed, and applied to more scenarios.