The utility model discloses a continuous pipe cutting machine which comprises a gear box, a servo motor, a power transmission mechanism, crank mechanisms, an annular sliding groove and saw webs, wherein the servo motor is fixed at one end of the top surface of a box cover, a control input gear is arranged on an output shaft of the servo motor, a worm mechanism is arranged on the upper portion of the interior of the gear box, a guiding gear meshed with the control input gear is arranged at one end of the worm mechanism, a hollow main shaft is arranged at the center of the box cover, the power transmission mechanism meshed with the worm mechanism is arranged on the hollow main shaft, the three crank mechanisms are arranged on the power transmission mechanism, each crank mechanism is provided with a saw web and a small crank shaft, the annular sliding groove is formed in the lateral side of the gear box, the end of each small crank shaft is in sliding connection with the annular sliding groove, and the hollow main shaft serves as both a shaft and a feed inlet. The continuous pipe cutting machine is capable of achieving pipe cutting quickly and achieving automatic feeding and retracting, simple in structure, low in manufacturing cost, and suitable for factories in various scales.