The invention discloses an automobile part welding device which structurally includes a welding device base, a welding head, clamps, an operating table, a clamp moving device, a supporting foot, a base, a displacement control knob and a control panel. The welding device base is fixedly mounted at the center of a panel on the front of the operating table, the welding head is disposed on the weldingdevice base and mechanically connected with the welding device base, the number of the clamps is two, and the clamps are arranged on the operating table and are of a symmetrical structure with respect to the welding device base. The automobile part welding device is matched with a clamping control device through the clamp moving device, the distance between the clamps is adjusted according to actual requirements, the distance between two clamping plates is controlled, the damage or even deformation of automobile parts easily caused by the two too tight clamping plates or the failure in smoothwelding caused by the two too loose clamping plates is avoided.