The invention discloses a novel magnetic attraction type dustproof computer case. The computer case comprises a case, a fixing frame is fixedly connected to the side wall of the machine box; an exhaust fan is arranged on the side wall of the fixed frame; a sliding rail is arranged on the lower side of the fixing frame; a sliding plate is connected into the sliding rail in a sliding manner; a duststorage bag is arranged on the side wall of the sliding plate and located at an air outlet of the exhaust fan, a limiting mechanism is arranged on the side wall of the fixing frame, a limiting hole isformed in the side wall of the sliding plate, the limiting mechanism is matched with the limiting hole, and four fixing plates are fixedly connected to the side wall of the machine box in a rectangular shape. The computer case is provided with the dust suction device, dust is sucked nearby fur and then sucked into the dust storage bag through the exhaust fan, components in the case are kept cleanfor a long time, only the dust storage bag needs to be cleaned regularly, the case does not need to be disassembled for cleaning, the number of times of opening the case is reduced, and the components in the case are prevented from being considered to be damaged.