Automatic welding machine

The utility model provides an automatic welding machine, and belongs to the technical field of welding machines. The problems that time and labor are wasted and machining quality is affected due to repeated clamping during welding operation of an automobile seat framework body and a connecting piece in the prior art are solved. The automatic welding machine comprises a machine frame, an upper electrode and a lower electrode, the upper electrode and the lower electrode are arranged on the machine frame and can move oppositely, a first frame which can move left and right relative to the machine frame and is located between the upper electrode and the lower electrode is arranged on the machine frame, and a second frame which can move front and back relative to the first frame is arranged on the first frame. The second frame is provided with a tool plate capable of ascending and descending relative to the second frame and fixedly provided with a plurality of movable limiting columns, the tool plate is provided wi