According to the main characteristics and technological process of surfacing welding of a nuclear power product. It is designed to a high performance PLC control system based on the Device Net Bus,which is equipped with digital welding power source,double tungsten electrode welding torch,touch screen,servo positioning control system,arc voltage high speed processing system,wireless automatic communication system,automatic welding three-dimensional slide frame and other elements of double tungsten electrode surfacing equipment. The field test shows that the system has strong the reliability,automation,anti-jamming ability and expansi-bility. The surfacing welding efficiency is 1 times higher than that of single tungsten electrode. These test items which are UT flaw detection,weld chemical composition,bending performance,intercrystalline corrosion,hardness,metallographic st-ructure and other detection items,are qualified.