Wire cutting machine home roll

The utility model discloses a wire cutting machine home roll, including a cylindrical home roll, wherein a plurality of grooves are opened at the excircle surface of the home roll, the flute pitch of the grooves are descended in sequence from left to right to adapt to the steel wire abrasion trend, and the degressive fixed value is the value of the difference value of the inlet flute pitch and outlet dividedly evenly by all home roll flute pitches, thereby realizing the wire cutting machining silicon wafer thickness consistency in the solar energy field, to further improve the yield and product quality of the monocrystalline silicon bar and to reduce production costs.