The utility model discloses a two side output formula straws of earth's surface debris can be clear away and still field machine is smashed, including frame, mounted frame, transmission system, straw reducing mechanism, screw feeder conveyor, spacing roller and ejection of compact casing. Be fixed with the aerofoil between the straw reducing mechanism blade holder, screw feeder conveyor left side helical blade and right helical blade spiral opposite direction, screw feeder conveyor is fixed with corresponding to the screw feeder axle both ends of ejection of compact casing department and prevents stifled pole, prevents that stifled pole, can be for 1 or several for shaft -like or adj. Tabular, ejection of compact casing is located the outside of frame. Compared with the prior art, the utility model discloses when smashing still field operation to crop straw, can effectively dispose the stem leaf that drops on on the face to straw after will smashing is placed in the face both sides, is guaranteeing that crop straw still under the circumstances in field, can retrieve for incomplete membrane and create good operating condition.