The invention provides a smoke denitration method. The smoke denitration method comprises the following steps: carrying out oxidation reaction on to-be-denitrated smoke and a denitration oxidant; carrying out absorption reaction on the smoke subjected to the oxidation reaction when the smoke flowing through an absorbent and finishing the denitration of the smoke. According to the method provided by the invention, oxidation reaction and absorption reaction are sequentially carried out on the to-be-denitrated smoke; in the process of oxidation reaction, NO, a main component difficult to dissolve in water in NOx in the smoke is converted to high-valence nitrogen oxides easy to dissolve in water, such as NO2; then in the process of absorption reaction, the high-valence nitrogen oxides, such as NO2 react with water and an alkaline absorbent to finish the denitration process. The method provided by the invention ensures that oxidation reaction and absorption reaction are fully carried out, the denitration efficiency is improved, and the consumption of materials, such as a the denitration oxidant and the absorbent is reduced.