Supercapacitors with the advantages of high power density and rapid discharging rate have widespread applications in energy storage. Nevertheless, their development is hindered by the limitation of low specific capacity. Traditional approaches to enhance specific capacity primarily involve incorporating foreign atoms and blending with additional reactive substances. Herein, a photo-assisted supercapacitor electrode materials (GN/ MnO2 nanocomposite) with excellent capacity is developed. As a photoactive material, graphene generates electrons and holes with photoirradiation. With the photogenerated carriers increases, electrons are separated from the holes and stored as charges. Photoirradiation as the driving force promote the energy storage and conversion of supercapacitor. Although there are many reports on GN/ MnO2 composites. there are still few report on the photo-assisted energy storage of this composite material. The specific capacity of this photo-assisted GN/ MnO2 electrode materials could reach to 210 F/ g with photoirradiation, it was higher than that of without photoirradiation (170 F/ g). The development of this study provides important theoretical guidance and practical significance for the research of photo-assisted energy storage materials, and acts a significant role in advancing the progress of energy storage devices with high specific capacity.