The invention relates to a photovoltaic greenhouse system structure, and relates to the technical field of planting greenhouses. An inclined rod is fixedly disposed on support rods and is connected with a plurality of photovoltaic modules via brackets and hinges, and cylinders are fixedly disposed on the inclined rod and are connected with the photovoltaic modules through connecting rods. The lower edge of the outermost photovoltaic module is connected with a drainage ditch, and drainage holes are uniformly distributed in the drainage ditch and are connected with a fall pipe which is connectedwith a water tank. A spray pipe is fixedly disposed below the inclined rod, spray headers are evenly distributed in the spray pipe, and the spray pipe is connected with the water tank through a waterpump. A glass side plate is connected below the outermost photovoltaic module, and the photovoltaic modules are connected with the cylinders and the water pump through circuits. According to the photovoltaic greenhouse system structure of the present invention, electricity is provided for a ventilation system and an irrigation system through photovoltaic power generation, artificial ventilation and irrigation are not needed, automatic collection and irrigation of rainwater are achieved, energy is saved, and labor efficiency is high.