A mobile electronic device protective cover includes a cover body for holding a mobile electronic device, a sliding plate transversely mounted in a back side of the cover body and having a fragrant carrier and movable in and out of one lateral side of the cover body between an extended position and a received position, and a cover plate mounted in the back side of the cover body to keep the sliding plate from sight when the sliding plate is in the received position and having an air vent hole for enabling the good smell of the fragrance in the fragrant carrier to be diffused into the atmosphere.
