An optical charger includes a fixing block, a number of light receivers, a substrate, and a number of light emitters. The fixing block is used for receiving a battery. The light receivers are fixed on the fixing block. The battery is electrically connected to the light receivers. The substrate has a loading surface for loading the fixing block. The light emitters are positioned on the substrate and face the light receivers. The light emitters are electrically connected to an external power supply, and are used for converting electrical energy from the external power supply into optical energy and emitting light rays. The light receivers are used for receiving the light rays from the light emitters, and converting optical power of the light rays into electric energy. The battery receives and stores the electric energy.