A triboelectric nanogenerating device which is configured for providing electric power to an electronic device includes at least one scaly triboelectric membrane. The scaly triboelectric membrane is configured for triboelectric electrification and providing electric power to the electronic device, wherein the scaly triboelectric membrane includes keratin and polyvinyl alcohol (PVA), the scaly triboelectric membrane has a first triboelectric surface, and the first triboelectric surface includes a plurality of scaly layers. Each of the scaly layers is arranged in order and extends along an orienting direction, and a distal end of each of the scaly layers has a plurality of sawtooth structures. Hence, abrasion can be effectively reduced and stability of providing electric power can be improved. |