Full-automatic high-precision pipe cutting machine

The utility model relates to the technical field of pipe cutting devices, and particularly discloses a full-automatic high-precision pipe cutting machine which comprises a supporting frame, a cutting unit and a transmission unit, the supporting frame comprises a base and a top plate located above the base, and supporting plates are symmetrically and fixedly connected between the base and the top plate; the cutting unit is hung on the top plate through an air cylinder and is in sliding connection with the supporting plate, the transmission unit is arranged between the base and the supporting plate and comprises a first roller, a second roller and a roller column, the first roller and the second roller are hinged to the roller column through rotating shafts, and a pipe is clamped between the first roller and the second roller. The first roller and the second roller continuously rotate to generate friction force to push the pipe to move forwards, and the cutting unit slides down from the top plate to brake rotat