Steel pipe intersecting line cutting device

The utility model relates to the technical field of steel pipe cutting equipment, in particular to a steel pipe intersecting line cutting device which comprises a machine base. The annular frames are connected to the machine base, synchronous rings are coaxially and rotatably connected to the interiors of the annular frames, and plane threads are arranged on the synchronous rings; the supporting rods are slidably connected to the annular frame in the radial direction, supporting wheels are rotationally connected to the ends, facing the central axis of the annular frame, of the supporting rods, and threads matched with the plane threads are arranged on the side walls of the other ends of the supporting rods; the driving assembly is arranged on the machine base and used for driving the steel pipe to rotate; the cutting assembly is arranged on the machine base in a sliding mode and used for cutting the steel pipe; a tooth part is arranged on the circumferential side wall of the synchronous ring, a driving motor