The invention discloses a nitrogen oxide oxidation apparatus used for environment quality analysis. The nitrogen oxide oxidation apparatus comprises an apparatus body; the apparatus body is mainly composed of an air inlet, an air outlet, an air inlet pipe and a filling layer, the air inlet pipe is arranged in the apparatus body, the air inlet pipe is communicated with the air inlet, and the air inlet pipe is extended to the bottom in the apparatus body, a slide plate is arranged on the surface of the filling layer, a sealing ring is fixedly connected with the side edge of the slide plate, the sealing ring abuts the inner wall of the apparatus body, a bearing pedestal is arranged at the intermediate part of the slide plate, the air inlet pipe passes through the bearing pedestal and is connected with the bearing pedestal through a silicon seal in a sealing mode; a spring is arranged at top of the bearing pedestal, a communicating pipe is arranged on the side wall at the left side of the apparatus body, and two ends of the communicating pipe are communicated with the apparatus body. The oxidation apparatus greatly prolongs the stay time of air in the apparatus, nitric oxide gas in nitrogen oxide can fully oxidized to nitrogen dioxide, oxidation efficiency is high, and real effectiveness of environment quality detection data is greatly increased.