The utility model discloses an ash screening recovery unit gathers dust, include: the shale shaker for the gesso that will gather dust in the ash separates with the waste paper bits, feed inlet and dust collector exit linkage, and discharge gate and screw conveyer's access connection, the waste material mouth is connected with the reject bin, screw conveyer for carry plaster of stone powder storehouse with the plaster of stone powder of after -separating, the import with the discharge gate of shale shaker is connected, the export with the plaster of stone divides the storehouse to connect, plaster of stone powder storehouse is used for collecting the plaster of stone powder, the reject bin is used for collecting the waste material. Install a shale shaker additional in three exit positions of controlling the ash that gathers dust, separate shredded paper in the ash and plaster of stone dressing sieve, carry the equitable regional storage of extremely conveniently transporting and be used as the accelerant through a screw conveyer, improved the value of plaster of stone powder, practiced thrift raw and other materials, the manufacturing cost of greatly reduced gypsum board.