NOVELTY - Preparation of non-corrosion composite electrolyte comprises preparing three raw materials of not less than 99.5% refined ammonium chloride (NH4Cl), not less than 98% refined zinc chloride (ZnCl2), and composite corrosion inhibitor; mixing the refined NH4Cl, refined ZnCl2 and composite buffer agent; and stirring completely to obtain a non-corrosion composite electrolyte for a manganese dioxide dry cell.    USE - Preparation of non-corrosion composite electrolyte for a manganese dioxide dry cell (claimed).    ADVANTAGE - The method provides electrolyte having required concentration, is energy saving, highly efficient and low cost, and can accelerate the non-mercury process of manganese dioxide dry cell industry.    DETAILED DESCRIPTION - Preparation of a non-corrosion composite electrolyte comprises preparing three raw materials of not less than 99.5% refined ammonium chloride, not less than 98% refined zinc chloride, and composite corrosion inhibitor. The weight ratio of each material is 4-64% refined ammonium chloride, 34-94% refined zinc chloride, and 0.1-20% composite corrosion inhibitor. The composite corrosion inhibitor is sodium polyacrylate, ester surfactant and polymer chelating dispersing agent and clean water. The refined ammonium chloride (NH4Cl) is prepared by putting agricultural ammonium chloride, circulating mother liquor into reaction kettle for heating, dissolving, removing impurities and filtering, cooling the filtrate, crystallizing at high purification and centrifuging, drying and obtaining refined NH4Cl of not less than 99.5%. The refined zinc chloride (ZnCl2) is prepared by putting industrial ZnCl2 and water to reaction kettle for heating, dissolving, removing impurities and filtering, cooling the filtrate and crystallizing at high purification and centrifuging, drying and obtaining the refined ZnCl2 of not less than 98%. The composite buffer agent is prepared by adding 1-10% sodium polyacrylate, ester surfactant and polymer chelating dispersing agent and clean water to reaction kettle; and uniformly stirring at normal temperature. The buffer agent organic surface active molecule takes up the activity center of the corrosion reaction, increasing the reaction activity of anode or cathode, when the cell is not use, the zinc is in stable level, the buffer agent preferably absorbs to stop the zinc to dissolve; when the cell discharges, the buffer agent can smoothly separate from the zinc surface and not block the zinc to dissolve. In the early time of discharging, the voltage is lower than the mercury cell; the dispersing agent does not block the metal ions to settle, and can block the hydrolysis precipitation to prevent the corrosion on the inner surface of the zinc barrel. The refined NH4Cl, refined ZnCl2 and composite buffer agent are mixed and stirred completely to obtain a non-corrosion composite electrolyte for a manganese dioxide dry cell.