The invention relates to a device for automatically and repeatedly adding water through a spiral water pump. The device is characterized in that an automatic water adding mechanism is additionally arranged on a pot for boiling rice dumplings, and therefore when the rice dumplings are boiled, normal temperature water can be automatically added into boiled water inside the pot. The automatic water adding mechanism comprises a pot cover, a water container, a plurality of vertical columns, a spiral water pump assembly, a water storage basin and a steam ejection pipe. when steam gathered in the pot is rapidly ejected through a steam ejection pipe, the steam shocks an impeller, the impeller drives an impeller shaft and the spiral water pump to rotate; when the spiral water pump rotates, normal temperature water is continuously sucked from a water inlet of the spiral water pump and then is drained to the water storage basin from a drainage opening of the spiral water pump; the normal temperature water in the water storage basin flows into the pot through a spiral throttle pipe, water in the pot stops boiling, and the spiral water pump stops drainage; and later, the device for automatically and repeatedly adding water repeats an operation process in an automatic water adding stage. Through the device, the normal temperature water can be automatically and repeatedly added into the pot in an unpowered manner, and then the outer layers of the rice dumplings will not fracture while being overdone.