The invention relates to an environmental protecting multifunctional coating and its preparing method, which employs organic-inorganic composite raw charge with the weight percentage: organosilicon resin 10-15%, silicasol 20-25%, silver oxide 40-45%, cupric oxide 1-3%, bengala 1-5%, nickel oxide 1-3%, filling agent 20-25%, dispersants 0.05-0.10%, thickening agents 0.05-0.10%, wedding agent 0.05-0.10% and foam killer 0.05-0.10%, and obtains products after proportioning, commingle, milling, mixing round and natural drying. This invention is widely used at the surface of metal, inorganic metal(such as glass, ceramic) materials to have the function of heat resisting and electric conduction with easy preparing pressure, easy-controlled, dispensing with calcining technology, energy-saving. environmental-protecting, high temperature of heat resisting, low cost of manufacture and good product performance.