The present disclosure relates to a computer peripheral device. The computer peripheral device includes a housing whereon an opening is formed, and a fixing module installed inside the opening in a reversible manner. The fixing module includes a base installed inside the opening, a locking head passing through the locking plate and fixed on the base at one end. The locking head includes a latching part for inserting into a slot on a casing of a portable computer when the base turns to a first position relative to the housing so that the latching part protrudes outside the housing. When the locking plate is pressed down so as to separate the latching part from the locking plate and the locking head rotates relative to the locking plate, the latching part cannot separate from the slot. The fixing module further includes a resilient component for pushing the locking plate.