Abstract: A fixing mechanism includes a first fixing plate, a second fixing plate corresponding to the first fixing plate, and a screw connecting the first fixing plate and the second fixing plate. The first fixing plate defines a receiving hole comprising a connecting portion. The second fixing plate defines a locking hole corresponding to the connecting portion. The screw comprises a threaded shank matching with the connecting portion and the locking hole. The fixing mechanism further comprises an elastic member positioned in the receiving hole, the threaded shank abuts against the corresponding elastic member, and an elastic resistance of the elastic member limits back and forth movement of the screw.