Workpiece fastening device for electric welding machine

The utility model relates to the technical field of welding, in particular to a workpiece fastening device for an electric welding machine, which comprises a sliding sleeve, a support frame, a top plate and a clamping mechanism, one end of the support frame away from the ground is fixedly connected with the top plate; clamping mechanisms are arranged at the two ends of the top plate; the clamping mechanism is used for fixing a metal plate; the clamping mechanism comprises a clamping plate; one end of the clamping plate is hinged to the top plate; the sliding sleeve is slidably arranged on the supporting frame in a sleeving mode. Connecting rods are arranged on the two sides of the sliding sleeve. When the metal plates need to be welded according to different angles, the sliding sleeve only needs to slide on the supporting frame, the two clamping mechanisms can conduct included angle positioning on the two metal plates according to the preset welding angle, a fastening device corresponding to the preset weldin