Water defrosting system for low-temperature refrigeration house

The utility model discloses a water defrosting system for a low-temperature refrigeration house. The water defrosting system comprises a first cold room, a second cold room and a defrosting circulating water pool, the first cold room and the second cold room are provided with a first air cooler and a second air cooler respectively; the defrosting circulating water tank defrosts the first air cooler and the second air cooler through a defrosting water pump and a defrosting water supply pipe respectively; the defrosting water supply pipe is connected with a water drain pipe; a first water seal device is arranged on the water drain pipe; a second water seal device is arranged on the defrosting drain pipe; a water draining valve is arranged on the water draining pipe; the water escape valve is closed in the defrosting process to ensure that the defrosting water pressure is stable, the water escape valve is opened after defrosting is completed, and the problem that when a cold room defrosting water valve is not cl