NOVELTY - A solid catalyst has sludge-based activated carbon as skeleton.    USE - Solid catalyst is used for adsorbing, absorbing and biological catalytic oxidation of organic waste gas (claimed).    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) preparation of solid catalyst, which involves centrifuge dehydrating the biological treatment sludge of wastewater treatment plant or sewage treatment station, obtaining biochemical sludge with water content of 40-50%, mixing the obtained biochemical sludge and crushed corncob in weight ratio of 20:3-4, adding the obtained mixture and activating agent to an activating kettle with stirring device, stirring and activating for 6-8 hours, centrifuge dewatering the obtained activated sludge with sludge moisture content of 10%, then drying in a vacuum dryer at 105-110 degrees C for 3 hours, obtaining dry sludge, grinding in a ball mill, sieving by a sieve with grain diameter of 1-2 mu m, carbonizing the dried sludge particles by nitrogen as protective gas with a flow rate of 10 L/hour in a tube-type resistance furnace, heating to 590-610 degrees C with a speed of 20 degrees C/minute for 3-4 hours, passing exhaust gases generated during carbonization process into an exhaust gas absorption cell containing alkali, coolig the solid to room temperature, grinding in a ball mill, sieving to diameter of 2 mu m, washing by clean water, and drying. The activating agent is 2 moL/L potassium hydroxide solution or 1.5 mol/L zinc chloride solution. The weight ratio of biochemical sludge and potassium hydroxide solid is 20:2-3. The weight of biochemical sludge and zinc chloride solid is 20:1-2; and    (2) usage method of solid catalyst for adsorbing, absorbing and biological catalytic oxidation of organic waste gas, which involves using high-efficient three-dimensional sieve-plate tower, and providing the solid catalyst into the high-efficient three-dimensional sieve-plate tower for contacting the organic waste gas with the solid catalyst.