A first body which the present invention is provided with a hopper up and down; A pair of crushing rollers formed in the first body in order to break through the grain; A second body coupled to the lower hopper; A pair of crushing rollers formed in the second body in order to crush the crushed grains; in the grain mill is configured to contain, further form a crushing roller in the interior of the first body, the crushing roller axis are formed to be inclined in the downward direction from the upper hopper; Crushing rollers on both sides of the crushing rollers are rotated at a high speed, the central crushing roller and the low speed rotation; The crushing rollers are formed by addition of the concave and convex arc shape in a row, the recess portion and the projection portion being physical fit such that a predetermined distance apart in the recess and convex portions of the adjacent crushing rollers, the outer surface has a plurality of protrusions of the crushing roller that for providing a grain mill is configured to be formed, the present invention is from, but configuring the crushing roller in the three axes, the supply of the axis of the crushing roller feeder of the central crushing roller is a low speed rotation, shredding rollers of both sides to the high-speed rotation by forming inclined downwardly primary crushing by the crushing rollers and the central crushing roller of oencheuk, the grains could not digested by the primary crushing is to occur the secondary crushing by the crushing rollers in the central crushing rollers and the right preventing the waiting grain is pushed to both sides of the roller, and further wherein the crushing rollers are formed by the concave portion and the convex portion continuously the O Neck portion and a convex portion being physical fit such that a predetermined distance apart in the recess and convex portions of the adjacent crushing rollers, the outer surface is formed with a plurality of projections of said crushing rollers being formed is crushed area longer than the conventional crushing rollers crushing and grinding efficiency this is very useful inventions to be further improved.