The invention discloses a low-low-temperature dust removing, water saving and desulfurizing integrated system. The low-low-temperature dust removing, water saving and desulfurizing integrated system comprises a solution side and a smoke side. The solution side comprises a generator, a first throttle valve and an evaporation coil. The smoke side comprises a low-low-temperature heat exchanger and a low-low-temperature electric dust remover. The low-low-temperature heat exchanger sequentially communicates with the low-low-temperature electric dust remover and a desulfurizing absorption tower through a smoke pipeline. The low-low-temperature heat exchanger provides a heat source for the generator. The generator is provided with a generator input end, a generator gas output end and a generator liquid output end. The generator gas output end sequentially communicates with the first throttle valve and the evaporation coil through a pipeline. The evaporation coil is arranged in the desulfurizing absorption tower and used for reducing the temperature of circulation pulp in the desulfurizing absorption tower. The low-low-temperature dust removing, water saving and desulfurizing integrated system is high in dust removing efficiency, water consumption of the desulfurizing absorption tower is low, and the efficiency of a boiler is high.