The invention discloses a pipe cutting machine tool which comprises an engine base. A feeding groove is formed in the middle, close to the bottom of the engine base, of the front face of the engine base; a containing box is arranged on the inner surface of the feeding groove; and a working room is arranged on the position, above the containing box, of the front face of the engine base. By observing a scale on a sliding marker rod, the appropriate positions of a positioning seat and a pipe cutting machine are adjusted; through the scale on the sliding marker rod, an operator can conveniently determine the length of a pipe needing to be cut, and after the positioning seat is fixed, the cutting position does not need to be determined for cutting every time; the pipe is pushed, and one end ofthe pipe is embedded into a pipe coincidence groove in a limiting pipe seat; under the effect of thrust, the limiting pipe seat moves towards the positioning seat and touches a pipe cutting telescopicair cylinder control switch on the positioning seat, and the pipe cutting telescopic air cylinder control switch controls a pipe cutting telescopic air cylinder to retract so as to enable the pipe cutting machine to cut the pipe; and after cutting is completed, a pipe cutting rod arm touches a stripping telescopic air cylinder control switch, a stripping telescopic air cylinder extends, and thusa pipe limiting block pushes the pipe to enter the containing box.