The invention discloses a tailgas condensed water circulating device. The tailgas condensed water circulating device comprises a heat exchanger, a wet hot steam inlet and a dry cold air inlet are respectively arranged at the upper end of the heat exchanger, and a dry hot air outlet and a wet hot steam outlet are respectively arranged at the lower end of the heat exchanger; the wet hot steam inlet is connected with an air outlet of a gas hood through an adjustable heat pump, and the wet hot steam outlet at the bottom part of the heat exchanger is connected on a heating chamber of a central circulating evaporator through a circulating water pump I; one path of the gas entering the heating chamber enters an evaporating chamber, and the other path of the gas enters a steam compressor through a flash tank connected with the lower part of the central circulating evaporator; a gas outlet of the steam compressor is circularly connected on the heating chamber; the central circulating evaporator is sequentially provided with a shower nozzle, the evaporating chamber and the heating chamber from top to bottom; condensed water produced at the bottom part of the central circulating evaporator is connected on the evaporating chamber through a circulating water pump III; and the top part of the central circulating evaporator is connected with the adjustable heat pump through a pipeline. The tailgas condensed water circulating device has the characteristics of simple structure and high efficiency.