The utility model relates to an efficient desulfurization waste water softens processing apparatus belongs to environmental water processing field in the flue gas desulfurization system. An efficient desulfurization waste water softens processing apparatus, includes: waste water aeration settling basin, its one side are equipped with water inlet, its inside online pH monitor, agitating unit and aeration equipment A of being equipped with, the sedimentation tank, closed waste water aeration heating bath, its bottom is equipped with aeration equipment B, and it is through exhaust?pipe and cooling flue gas deareator intercommunication. The device can effectively utilize the CO2 in the flue gas and reduce the flue gas waste heat, when reducing the carbon emission, can reduce the thermal pollution.