Abstract: Taking sintering flue gas simulated in the laboratory as the research object, the effects of microwave heating temperature, microwave treatment time, modified activated carbon dosage, flue gas flow rate and gas concentration on microwave denitration were studied. The test results showed that increasing the microwave heating temperature and increasing the amount of activated carbon can significantly improve the microwave denitration efficiency. When the microwave heating temperature is 700 ℃ and the activated carbon dosage is 30 g/L, the denitration efficiency is 57.6% and 70.02%, respectively. When the microwave heating time is increased from 3min to 15min, the denitration efficiency is increased from 55.45% to 62.8%, but the effect is not obvious. When the flue gas flow rate is 0.3 L/min, 71.9% denitration efficiency can be obtained, and detrimental effects on denitration is shown as the flue gas flow rate increases. Being affected by the adsorption of activated carbon, as the NO concentration in the flue gas increases, the NO removal efficiency gradually decreases. When the NO concentration is 200 ×10^-6, the denitration efficiency reaches the maximum of 80.25%.