Abstract: As an important part of welder training, virtual welding training has been widely used because of its advantages of environmental protection and low loss. Firstly, the existing virtual welding training system and its architecture was summarized in this paper. Secondly, the key technologies of virtual training system of welding was analyzed and combed from five aspects, the stereo display technology, welding pool shape modeling method, multiple target tracking technology, force feedback technology and the virtual welding training evaluation. Finally, the defects existing in the current virtual welding training system were analyzed. On this basis, the future development trend was prospected.Highlights: By sorting out research on virtual welding training system at home and abroad, the model framework of virtual welding training technology was summarized. On this basis, the key technologies of virtual welding training were extracted, and the future development of virtual welding training technology was prospected based on existing research results.