The utility model relates to a corn roller which belongs to the grain and rice processing machinery. A partition board with a material inlet of a lower milling chamber is fixedly installed in a screen drum of the corn roller, and the screen drum is divided into an upper milling chamber and a lower milling chamber. A top movable grinding wheel, an upper burnishing grinding wheel and a lower burnishing grinding wheel which are fixedly sheathed on the top of a main shaft are respectively arranged in the upper milling chamber and the lower milling chamber. The upper part of the screen drum is fixedly provided with an umbrella type fixing grinding head which is matched with the top movable grinding wheel. A transmission assembly which is composed of a transmission assembly shell body, a driving bevel gear, a driven bevel gear, a power input shaft and a belt roller is fixedly arranged between a shell body and a machine base. The structural design is novel and reasonable, and the utility model has the characteristics of favorable operation quality, high efficiency, low grain loss, saving energy, wide applicability and long service life. The utility model can be suitable for the peeling, removing navel, chamfering and polishing of corn seeds and the seed peeling and rice milling operation of wheat, grain, sorghum, etc.