The invention discloses a dustproof paper shredding device. The dustproof paper shredding device comprises a machine body and a machine cover connected to the machine body. A paper inlet is formed in the side wall of the machine body. The machine cover comprises a concertina fold cover body and a control cover body. The control cover body is formed by fixedly connecting a swing plate and a baffle end to end, an included angle is formed between the swing plate and the baffle, the joint of the swing plate and the baffle is hinged to the machine body, and the paper inlet is covered with the baffle. One side of the concertina fold cover body is connected to the machine body, the other end of the concertina fold cover body is hinged to the swing plate, and a button is installed above the hinge position of the swing plate and the concertina fold cover body; and a fixed plate is fixedly connected to the position, parallel to the portion under the hinge position of the swing plate and the concertina fold cover body, of the machine body, the hinge position of the fixed plate and the concertina fold cover body and the hinge position of the swing plate and the concertina fold cover body are connected through compression springs, and the fixed plate is further provided with magnetic parts for attracting the machine cover. By means of the technical scheme, the problems that a paper inlet of an existing paper shredding device is open, consequently, impurities easily enter the paper shredding device, and the paper shredding device frequently breaks down are solved.