In order to reduce the mass concentration of NO_x and SO₂ emission in the flue gas and improve the combustion efficiency of solid fuel, a 50 kg sinter pot test is carried out based on the sintering raw material of a steel plant, and the effects of total injection, injection flow and start spraying time on NO_x and SO₂ emissions during the sintering process under the condition of spraying steam to the sintering charge level are studied. The results show that, after ignition for 8 min, steam is continuously sprayed to the charge level for 15 min, and when the injection flow is 0.02 m³/min, the mass concentrations of NO_x and SO₂ emissions in the sintering gas are reduced by 11.75% and 13.25%, respectively, and the production and quality indexes of sinter are also optimized. The addition of steam is conducive to breaking the molecular bonds of solid fuels, accelerating the precipitation process of HCN and NH₃ in the volatiles of solid fuels, enhancing the local reducing atmosphere of the sinter bed, thereby promoting the heterogeneous reduction reaction of NO in the sintering process and reducing the mass concentration of NO_x emission. Spraying steam to the charge level will thicken the super-humid layer, so that SO₂ is gradually absorbed in the super-humid layer, and when the super-humid layer disappears, SO₂ is insufficiently released instantaneously, thereby reducing its emission mass concentration and delaying its emission peak. The steam spraying process system is conducive to improving quality and reducing consumption in sintering production, and can provide references for the production of iron and steel enterprises.