NOVELTY - Sewage sludge, fly ash and clay are stirred, pressed, manually granulated and cut, to obtain spherical particles of ceramic raw material. The spherical particles are dried, calcined and naturally cooled, to obtain porcelain granules. Porcelain granules are immersed in solution containing copper chloride and nickel chloride, and dried. Epoxy resin, amide resin and ethanol are blended, and starch is added and mixed. The impregnated porcelain granules are baked, and mixture is uniformly coated and dried, to obtain trace elements-sustained-release copper-nickel ceramic element.    USE - Preparation of trace elements-sustained-release copper-nickel ceramic element (claimed).    ADVANTAGE - The method enables preparation of trace elements-sustained-release copper-nickel ceramic element with chemical oxygen demand value increased by more than 12%.    DETAILED DESCRIPTION - Sewage sludge, fly ash and clay are dried at 105 degrees C, ground in grinder and sieved to 200 mesh. 3-5 g Sewage sludge, 6-8 g fly ash and 8-10 g clay are stirred, and water is dripped and stirred, to obtain wet raw material. The wet raw material is pressed or extrusion molded, manually granulated and cut, to obtain spherical particles of ceramic raw material having particle diameter of 4-6 mm. The spherical particles are dried in electric heated blast dryer at 100 degrees C, provided to box-type resistance furnace, preheated at 450 degrees C for 20-25 minutes, calcined at 1050 degrees C for 16-20 minutes and naturally cooled, to obtain porcelain granules. Porcelain granules are immersed in solution containing 0.5-1.5 mol/L copper chloride and 0.5-1.5 mol/L nickel chloride for 24 hours, and dried. 2.5-4 mL Epoxy resin, 3-5 mL amide resin and 10-15 mL ethanol are blended, and 0.5-1.5 g starch is added and mixed. The impregnated porcelain granules are baked and stirred, and the mixture is uniformly coated to ceramic surface and dried in oven, to obtain trace elements-sustained-release copper-nickel ceramic element.