Working description: With the presence of a surface catalyst, high effective the catalytic oxidation tower uses of strong oxidizing agents - chlorine dioxide, under atmospheric pressure at room temperature catalytic, shall carries out the oxidation of organic pollutants in wastewater, or direct oxidation of organic pollutants, or contaminants oxidation of organic molecules into small molecules of organic pollution objects, to improve biodegradability of the wastewater for a better way to remove organic pollutants. During the degradation of COD in the process , organic molecules in the double bonds of chromophores such as azo, nitro, sulfide, hydroxyl, imino carbon and so on inside organic molecules shall be interrupted in order to achieve the purpose of decolorization, while make wastewater easy to biodegrade once effectively improve the BOD / COD value. In this way, chlorine dioxide catalytic oxidation reaction by chlorine- dioxide take a role as bridge between the conventional physical pre-treatment and bio-chemical treatment for wastewater with a high concentration, high toxicity, high-salinity. Efficient surface catalyst (a variety of rare class) with activated carbon as a carrier, shall go through multiple impregnation and heat treatment.