The utility model discloses an integrative size-grading and dust-removing apparatus for bulk materials. The size-grading and dust-removing apparatus for bulk materials is additionally provided with a spiral screen net in a cyclone dust remover. After the bulk materials enter in the apparatus by air transport, the utility model can automatically grade the bulk materials and removal dust according to different particle sizes. Thus, the working place can not be influenced by the particle dust, and the complete apparatus has no moving parts. The utility model has compact structure, convenient and fast operation. The utility model is suitable for food processing, grain storage and size grading and dust removal of cement, other building, chemical materials and coals.