The invention discloses a denitration treatment method and equipment for sintered flue gas. The denitration treatment method comprises the following steps that S10, a sintering material is ignited; and S20, a reduction medium is sprayed into the ignited sintering material, so that the reduction medium reacts with an oxidant around the sintering material so as to control the combustion atmosphere of the sintering material. By means of the denitration treatment method for sintered flue gas, the reduction medium is sprayed onto the surface of the sintering material during sintering production, sothat reduction medium reacts with the surrounding oxidant so as to control the combustion atmosphere of the sintering material such as the oxygen content, so that the generation of the nitrogen oxides is inhibited, reacting with the nitrogen oxides already produced during sintering can also be conducted, the nitrogen oxides are reduced to the nitrogen, the emission of the nitrogen oxides is reduced accordingly, and the cost is low.