Chain automatic welding machine with reference foreign advanced technology and independent innovation, self-designed and manufactured their own chain of automatic welding machines, by the chain link conveyor, rotating to, welding, upsetting the top, debarring composed of a dozen actions, through the coding devices, electrical, pneumatic and other institutions to implement the action, a high degree of automation can be carried out manually, point moving, semi-automatic and fully automatic, action, stable and reliable operation and maintenance convenient and complete fault protection. Main performance index has reached the level of similar foreign products. Using cam upset, cylinder pressed, contact close to switch control device can automatically compress, welding, upset, maintain, ending the whole process, with a good shape, high efficiency high degree of automation, control, high precision, the operation simple and convenient, reliable and so on.