Photovoltaic generation has the disadvantage of being intermittent, and a sustainable energy storage system is needed to meet demand. A photovoltaic-PEM (proton exchange membrane) hydrogen storage system was introduced, by which electrical energy was converted into hydrogen to store, and later hydrogen was converted into electrical energy through a PEM fuel cell. The system included photovoltaic power generation system, PEM hydrogen production electrolyzer and fuel cell, etc. Hydrogen was generated through the electrolysis of water, the hydrogen was stored in a compressed storage tank under high pressure for later use, when the system needed later, the hydrogen would be exchanged electricity through PEM fuel cells. The output current of the photovoltaic power generation system was controlled by PI controller to stabilize the input current of the electrolyzer. For photovoltaic-PEM hydrogen storage systems, the main problem is the dependence on weather conditions.The operation process of photovoltaic-PEM hydrogen storage system was simulated through system modeling, and the impact of light intensity related to solar photovoltaic output current on hydrogen production, hydrogen storage, and later hydrogen re-electrification was evaluated, which is helpful for subsequent research for energy storage issues associated with solar, wind, and other intermittent power generation.