Butt welding machine

The utility model relates to the technical field of butt-welding machines and discloses a butt-welding machine which comprises a butt-welding machine body, a supporting mechanism is arranged on the outer side of the butt-welding machine body, a grinding mechanism is arranged on one side of the butt-welding machine body, and the supporting mechanism comprises a supporting plate, a first driving motor, a first threaded rod, a connecting frame, a second threaded rod and a pressing piece. The two supporting plates are welded to one side and the front face of the butt-welding machine body correspondingly, the first driving motors are arranged on the outer sides of the supporting plates, one ends of the first threaded rods are fixedly connected to the output ends of the first driving motors, and the other ends of the first threaded rods are rotationally connected to the outer side of the butt-welding machine body. According to the butt-welding machine, a second threaded rod drives a pressing piece to clamp a steel