When brown rice enters the rice milling chamber, the material tumbles under the joint action of the sand roller, rice knife and sieve plate. There is continuous extrusion, friction and grinding between the materi-al, between the material and the sand roll-er, and between the material and the sieve plate, grind the bran powder layer on the surface of brown rice and discharge it out of the machine through the bran suction fan. In production, multiple machines can be used in series, or one machine can be used to produce white.