Punching device for metal pipe machining

The utility model discloses a punching device for metal tube processing, which relates to the field of tube processing punching and comprises a working table and an upper frame, the upper frame is arranged at the top of the telescopic working table, a tube placing groove is arranged at the top of the working table, an end table is arranged on one side of the tube placing groove, a screw is mounted on the end table through a threaded hole, and the upper frame is connected with the end table. A rotating cap is arranged at the top of the screw rod, a pressing disc is arranged at the bottom of the screw rod, a convex column is connected to the interior of the pressing disc through a spring, one end of the convex column penetrates through the bottom end of the pressing disc, and fixed sliding frames are arranged at the two ends of the pipe containing groove. According to the utility model, the pressing disc which rotates and ascends and descends through the screw rod is arranged on the end table, the spring is arr