To provide a pulverizing machine for grain CHAFFS which can save the time for pulverizing.

Screw vanes of a screw conveyor for supplying the grain shells from a hopper to a pulverizing section are partly lacked and the lacked parts 22 are provided with cutters 23 which are fixed to the cylindrical parts of the screw conveyor and are inwardly projected. The screw conveyor is formed as a twin-screw type. The two shafts 19A and 19B are arranged by the spacing on the pulverizing section side narrower than on the hopper side. The grain shell introducing side of the pulverizing section is provided with receiving blades in such a manner that the spacings from a hammer head may be maintained during the crushing work. The spacings of the receiving blades to the hammer head are made freely regulatable.