Exhaust pipe cutting machine

The utility model discloses an exhaust pipe cutting machine, and particularly relates to the technical field of cutting machine devices, the exhaust pipe cutting machine comprises a working table and a saw blade arranged at the top of the working table, the left end and the right end in the working table are movably connected with second threaded rods through bearings, and the top ends of the second threaded rods penetrate through the working table and extend out of the top end of the working table; a worm wheel penetrates through the bottom end of the second threaded rod at the right end, a worm is meshed with the rear end of the worm wheel, belt wheels are fixedly arranged outside the bottom ends of the two second threaded rods, the same belt is arranged at the outer ends of the two belt wheels, and a lifting mechanism for controlling the saw blade to move up and down is arranged at the top end of the workbench. A clamping mechanism used for clamping exhaust pipes with different diameters is arranged under