Rubber water seal structure for pump

The utility model relates to a rubber water seal structure for a pump. The rubber water seal structure for the pump comprises a stuffing box, a shaft, a rubber sealing ring, a copper pressing ring and an inner water retaining ring, wherein a pump cavity is positioned in one side of the stuffing box; a shaft seal water inlet is formed in the stuffing box; the rubber sealing ring is arranged on the stuffing box and on one side of the pump cavity, and is fixedly pressed through the copper pressing ring; and the inner water retaining ring is fixed on a shaft in the pump cavity. Because the rubber sealing ring is arranged between the pump cavity and shaft seal water, the shaft seal water can enter the pump cavity through a rubber water seal, and media of the pump cavity are stopped from entering the stuffing box and damaging the stuffing box; and the service lives of the stuffing box and the shaft are prolonged.