Industrial nitrogen oxides treatment agent effectively catalyzes the decomposition and absorption of nitrogen oxides in the air. The polymer plant extracts in the product quickly capture the nitrogen oxides in the air and catalyze the decomposition, absorption and immobilization of the nitrogen oxides into harmless components that can be absorbed and utilized by plants. Relying on the absorption and immobilization technology, it can avoid the rebound of nitrogen oxides released due to water evaporation, and decompose and get rid of nitrogen oxides pollution from the root.