Pipeline cutting machine

The invention relates to a pipeline cutting machine which comprises a power box, driving wheels, safety wheels, an adjusting assembly, a crawler, a rack and a power supply control box, wherein a motor is arranged in the power box; one end of the power supply control box is connected with a power supply terminal; the other end of the power supply control box is connected with the motor; the power supply control box determines whether to provide electric energy for the motor; the adjusting assembly is arranged on the power box; the rack and the adjusting assembly are arranged integrally; the rack is used for fixing a cutting gun; the distance between the gun head of the cutting gun and the central axis of the cutting machine changes under the adjusting action of the adjusting assembly so as to obtain pipelines with different diameters; the safety wheels are arranged at the bottom of the power box; the crawler passes through the safety wheels and winds around a pipeline once so as to fix the pipeline cutting machine onto the pipeline; the driving wheels and the power box are arranged integrally; the motor drives the driving wheels to work under the action of the electric energy; and the driving wheels drive the pipeline cutting machine to move along the pipeline within a limited range of the safety wheels.