The invention discloses a photovoltaic agricultural greenhouse. The photovoltaic agricultural greenhouse comprises a greenhouse body, a water tank is fixedly connected to the top of the greenhouse body, hoses are communicated with the bottom of both sides of the water tank, and the ends, away from the water tank, of the hoses extend to the interior of the greenhouse body and are communicated with a connecting pipe; nozzles are communicated with the bottom of the connecting pipe, a cover plate is movably connected to the top of the right side of the water tank through a hinge, and a shell is fixedly connected to the top of the left side of the water tank. According to the photovoltaic agricultural greenhouse, through cooperative use of the greenhouse body, the water tank, the hoses, the connecting pipe, the nozzles, the cover plate, the shell, a clamping column, a first clamping block, a connecting column, a pulling ring, a baffle, a spring, a second clamping block and a moving block, the problems that existing photovoltaic greenhouses can only keep out the rain and cannot make use of rainwater in the using process are solved, the photovoltaic agricultural greenhouse has the advantage of rainwater use, the economic consumption of a user is reduced, and the practicability of the existing photovoltaic greenhouses is improved.