The embodiment of the invention provides a nitrogen oxide emission control method and device. The method comprises the steps of obtaining the current nitrogen oxide emission state; obtaining the current positional state of a sintering final point; and according to the current nitrogen oxide emission state, the current positional state of the sintering final point and a preset strategy, adjusting the air draft capacity of a sintering system. According to the nitrogen oxide emission control method and device, the air draft capacity of the sintering system is adjusted according to the current nitrogen oxide emission state, the current positional state of the sintering final point and the preset strategy, so that on the premise that it is guaranteed that the sintering final point is at the reasonable position, the air blast capacity is properly increased, and the sintering speed, namely the vertical sintering speed, achieved in the sintering process can be increased; thus, the thickness ofa burning belt is reduced; furthermore, the generation probability of nitrogen oxide is lowered; the cost is low, and in addition, physical properties of sintered ore are not affected; and quality ofthe sintered ore can be guaranteed.