Welding device for axle tube of trailer axle

The utility model discloses a trailer axle shaft tube welding device which comprises a base, the upper side wall of the base is fixedly connected with a supporting rod, the top end of the supporting rod is fixedly connected with a lantern ring, the inner wall of the lantern ring is rotatably connected with a circular ring plate, the inner bottom wall of the circular ring plate is symmetrically and fixedly connected with fixing rods, and the fixing rods are fixedly connected with the supporting rod. A bearing plate is jointly and fixedly connected to the top ends of the two fixing rods, a hydraulic cylinder is fixedly connected to the inner top wall of the annular plate, a clamping plate is fixedly connected to the end, close to the bearing plate, of the hydraulic cylinder, an axle body is arranged between the bearing plate and the clamping plate, and vertical plates are symmetrically and fixedly connected to the upper side wall of the base; the top ends of the two vertical plates are jointly and fixedly conne