The utility model relates to a reamer, including a set of blade A, a set of blade B, a set of blade C, a set of blade A, a set of blade B, the equal fixed connection of a set of blade C are on the axle sleeve, and two blade A are about the axis central symmetry of axle sleeve, and two blade B are about the axis central symmetry of axle sleeve, and two blade C are about the axis central symmetry of axle sleeve, blade A includes cutting edge A, blade B includes cutting edge B and sets up the vice sword in blade B both sides, blade C includes the sawtooth, be provided with the keyway on the axle sleeve, the keyway includes keyway A, keyway B, and keyway A and keyway B are about axle sleeve central line central symmetry, blade A, blade B, blade C's back is the arc, compared with the prior art, the utility model discloses a blade that third mate's function is different has strengthened reamer in the face of the adaptability of different meats when the minced steak, and reamer vibrations when rotatory simultaneously are little, and less noise and vibrations have practical reliable advantage.