Circulating water supply structure

The utility model relates to the technical field of cultivation, in particular to a circulating water supply structure. The water dispenser comprises a backflow mechanism which is arranged in a water storage tank and enables water in the water storage tank to flow into the water dispenser; the moving mechanism is arranged at the bottom of the water dispenser; the cleaning assembly is arranged on the moving mechanism and abuts against the bottom of the water dispenser; the water fountain is provided with an impurity discharging opening, and the blocking assembly is detachably arranged at the impurity discharging opening and used for blocking the impurity discharging opening. By arranging the moving mechanism, the cleaning assembly and the blocking assembly, the blocking assembly is detached and exposed out of the impurity discharging opening during cleaning, the moving mechanism is started to drive the cleaning assembly to move, impurities at the bottom can be pushed to the impurity discharging opening to be d