Photovoltaic module back cooling device

The utility model relates to the field of photovoltaic module cooling equipment, in particular to a photovoltaic module back cooling device. The device comprises a photovoltaic module and a water storage cover plate installed on the back of the photovoltaic module, the photovoltaic module is fixedly installed on a base through a supporting arm, a supporting plate is obliquely arranged at one end of the base, a water storage cavity is formed in the base, and the water storage cover plate is slidably installed on the back of a back plate and provided with an open groove. An opening communicated with the open groove is formed in the side wall of one end of the water storage cover plate, a water drainage pipe communicated with the open groove is installed on the side wall of the other end of the water storage cover plate in a penetrating mode, and one end of the water inlet pipe is communicated with the output end of the circulating water pump through a connecting pipe. And the back of the back plate and the inne