The present invention relates to an apparatus for reducing white lead and recovering waste heat of flue gas. More specifically, according to an embodiment of the present invention, provided is the apparatus for reducing white lead and recovering waste heat of flue gas, comprising: a main body including a first injection nozzle for injecting a first aqueous solution to flue gas supplied inside, and a second injection nozzle for injecting a second aqueous solution to the flue gas; a first circulation line for supplying an aqueous solution which pools in the bottom of the main body to the first injection nozzle; a second circulation line for supplying the aqueous solution collected in a central hopper supplied to the lower side of the second injection nozzle to the second injection nozzle; a first supply line for supplying a first aqueous solution stored in a first storage tank to the first circulation line; a second supply line for supplying a second aqueous solution stored in a second storage tank to the second circulation line; a water supply line for receiving water from the outside; and a heat exchanger provided on the second circulation line and the water supply line for exchanging heat between water flowing in the water supply line and the second aqueous solution flowing in the second circulation line. In the first aqueous solution and the second aqueous solution, chemicals for adsorbing contaminants and moisture contained in the flue gas are contained.
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