According to the objective law and process of the development of steel structure welding technology, combined with the current situation of steel structure welding engineering, from three aspects of base metal, welding material and equipment-"large scale use of high-strength steel in steel structure promotes the rapid development of China’s welding technology", "high-quality and highperformance welding material is the greatest support to ensure the progress of welding technology", and "the new welding machine is the progress of welding technology". This paper analyzes and demonstrates the factors influencing the progress of welding technology, such as weather resistance and corrosion resistance, heat-resistant steel, low strength ratio of welding, scientific research and production of welding materials and rapid pulse compression arc, especially the robot automatic welding technology and related engineering cases, trying to reveal the development direction of welding technology.