Square tube cutting machine

The utility model discloses a square tube cutting machine which is characterized in that a protective cover is fixedly connected to the center of the upper end face of a workbench, a sliding groove is formed in the protective cover, a two-way threaded rod is rotatably connected to the interior of the sliding groove, a rotary knob is fixedly connected to the right end of the two-way threaded rod, and a connecting block is connected to the surface of the two-way threaded rod in a threaded mode; the upper end face of the connecting block is fixedly connected with a first fixing rod, and the upper end face of the first fixing rod is fixedly connected with a first placing plate. When the cutting wheel abuts into the square pipe, cutting of the square pipe is completed, meanwhile, when a rotary knob is rotated clockwise, the first containing plate can move rightwards, the cut position of the square pipe abuts into the groove again, clamping of the square pipe is completed, the cutting wheel cuts multiple positions