The utility model discloses a can reduce corn threshing device of percentage of damage, which comprises a frame, be fixed with the motor in the frame, be equipped with the chamber that gathers materials in the frame, be equipped with the feed inlet at the frame top, it has the discharge gate to open in the bottom in the chamber that gathers materials, the rotation is equipped with two and gets ridof a wheelset in the frame, the wheelset of threshing is including the wheel I of threshing, thresh the wheel II and thresh the wheel III, be equipped with respectively from driving wheel and drive wheel in the axis of rotation of wheel III of threshing, be equipped with drive gear in the pivot of the wheel II of threshing, be equipped with the drive wheel in the pivot of the wheel I of threshing, be equipped with two action wheels on the output of motor, the import of managing of slagging tap is rectified two spaces of wheel between III of threshing. The utility model discloses directly having abandoned traditional high -speed rotation rasp bar cylinder, having adopted two to get rid of a wheelset and carry out in various degree the rubbing of cubic to the maize in proper order, upper and lower two gap lengths of getting rid of between the grain wheel steadily decrease along the moving direction of maize, ensure finally by in the pipe of slagging tap on the exhaust corncob no any granule remain to improve the effect of threshing of maize.