Abstract: For the characteristic of steel structure and its requirement for the welding robot,the status of application and research of welding robot on steel structure are summarized. The main problems of the application of robot intelligent welding on steel structure are non-standard member design and non-match between assembly accuracy and robot intelligence. By improving module,serial,standard design of steel structure members,building perfect welding database and developing high precision welding seam tracking technology and so on,the intelligent degree of welding robots will be gradually improved,so the difficulties of robot welding technology application of steel structure will be overcome step by step.