Abstract: An insect-repellent device comprising a housing to hold a charger and a circuit board, two insect-repellent units movably received in two recessed surface portions on the outside of the housing and electrically connected to the circuit board by two separate electric wires, two reel assemblies fastened on housing at two opposite sides and controlled to let off or take up the insect-repellent units, a power switch for power control, a sterilization control switch for sterilization control, and indicator lamps for power and sterilization indications respectively.