The invention relates to a de-dusting device which solves the problem of cleaning books and bookshelf. According to the technical scheme for solving the problem, the de-dusting device comprises four parts, namely, a supporting part, a clamping part, a lifting part and a cleaning part, wherein a supporting rod, an upper tank and a lower tank are arranged for supporting the books; a first rotating shaft and a second rotating shaft are arranged in the upper tank; a clamping mechanism and a lifting mechanism are supplemented to each other through a ratchet wheel and a friction wheel; finally, a baffle is arranged in the lower tank; a dust collecting rod is arranged on the baffle; the dust collecting rod is capable of sliding left and right; a compressed spring is arranged between the dust collecting rod and the lower tank; a rack is arranged on the rear side of the dust collecting rod; an incomplete gear is arranged on the second rotating shaft in the lower tank in a sleeving manner; the incomplete gear is meshed with the rack through a gear; a flywheel is arranged on the first rotating shaft; a linear wheel is arranged on the flywheel, is separated from the flywheel and rotates. The de-dusting device has the advantages of smart structure, convenience in operation, high practicability, capability of effectively solving the problem of sanitary dead angle on the contact parts of thebooks and the bookshelf, excellent cleaning effect and high working efficiency.