The utility model discloses a high -efficient desulfurization system of many pH subregion, including absorption tower tower body, confession thick liquid house steward, n 1 individual circulating pump, oxidation air blower and a plurality of separator, be equipped with the thick liquid pond in proper order from going in the tower body of absorption tower, hold the liquid layer, n 1 the layer sprays layer and defroster, the thick liquid pond is divided into n+1 layer subregion through the separator, and each layer subregion distributes under to from last in proper order, and each layer sprays the layer, and the top of absorption tower tower body is equipped with the exhanst gas outlet to distributing in proper order down from last, and the side of absorption tower tower body is equipped with the flue gas and enters the mouth, and this system can realize that each layer sprays layer differentiation of thick liquid pH value, and the realization sprays the configuration in proper order of liquid pH value from high to low.