Automatic arc welding machine

The utility model discloses an automatic arc welding machine which comprises a base and an electric welding machine body, a supporting frame is fixedly connected to the top of the base, a servo motoris installed at the bottom of the supporting frame, the top end of the servo motor is in transmission connection with a transmission shaft penetrating through the supporting frame, and the transmission shaft is sleeved with a sliding sleeve. The right end of the sliding sleeve is fixedly connected with a horizontally-distributed sliding rail, a sliding plate is embedded into the sliding rail in asliding mode, and an electric welding machine is rotationally connected into the right end of the sliding plate through a rotating shaft. According to the arc welding machine, firstly, an automatic welding structure is adopted, fixed-arc-length welding treatment can be automatically carried out on metal parts, the workload of operators is reduced, meanwhile, the welding treatment efficiency is improved, secondly, a combine