The present invention discloses an electric pulley welding machine aiming to solve the problems of the existing pulley welding machines such as low production efficiency, easy influence on welding quality, etc. The welding machine consists of a machine body (8), a rotating clamp device (5) and a welding gun (1). The rotating clamp device (5) is arranged in the central position on a fixing plate (6) blew the machine body (8), the welding gun (1) is arranged on the upper part of the machine body (8) by the bracket of the welding gun (1), and the central line of the welding gun (1) is crossed with the center of the machine body (8). The present invention has the advantages for improving production efficiency, processing quality, etc.