A three-in-one pipe cutting machine comprises a machine platform, a fast replacement chuck device, a feeder, a feed device and a cutter device, wherein the fast replacement chuck device, the feeder, the feed device and the cutter device are arranged on the surface of the machine platform; the fast replacement chuck device comprises a chuck servo motor, a transmission core shaft, a paper core shaftand a paper core bush, the chuck servo motor is in transmission connection with one end of the transmission core shaft, the paper core shaft is in sliding sleeved connection with the transmission core shaft, and the paper core bush is fixedly sleeved with the other end of the transmission core shaft; the feeder drives the paper core shaft to move in the extension direction of the transmission core shaft; and the feed device is arranged at one end of the paper core bush and drives the cutter device to move along the machined coiled material direction and cut machined coiled materials through the cutter device. The paper core shaft is matched with the paper core bush to horizontally fix the machined coiled materials and drive the machined coiled materials to rotate, the feeder drives the paper core shaft to slide to obtain the cutting length, the feed device drives the cutter device to complete cutting, for different materials, what is only needed is to replace the paper core shaft andthe paper core bush, use convenience is realized, replacement is fast, and one machine can achieve multiple purposes.