The utility model provides a pipeline pressure perforating machine, which adopts the technical scheme the pipeline pressure perforating machine consists of a machine seat, a machine body, a transmission case and a power device; the machine seat is fixed with the machine body, the machine body is connected with the transmission case, and the power device is mounted on the outer wall of the transmission case; in the machine body, the outer side of a boring bar is connected with a transmission sleeve through a double guide key and a guide groove, and the inner side of the boring bar is connected with a transmission screw through a nut; a sealing assembly is arranged at the connected part of the lower end of the boring bar and the machine seat; an adjusting hand wheel and a pull rod are arranged on the transmission case, and a worm gear pair, a feed variable gear cluster and a clutch are mounted in the transmission case; the feed variable gear cluster consists of a gear wheel I, a gear wheel II, a gear wheel III and a gear wheel IV; and the worm gear pair consists of a worm and a worm gear. The pipeline pressure perforating machine perforates the pipeline under the conditions that the pipeline doesn't stop conveying medium, doesn't reduce pressure and operates normally, and is highly safe.