The invention relates to a special additive for altitude environmental fuel and a preparation method thereof. Raw materials required by the special additive for the altitude environmental fuel comprise a combustion promotor, a detergent, a lubricant, a preservative, a sterilizing agent, an anti-rust agent and an antioxidant, wherein based on parts by weight, the combustion promotor accounts for 63to 73 parts, and the lubricant accounts for 11 to 15 parts. The special additive product for the altitude environmental fuel in the altitude region is used in the altitude environmental fuel, so thataccumulated carbon on different parts can be cleaned, and oil pipes, an oil nozzle and a combustion chamber are cleaned, and the effects of recovering power, reducing emission of pollutants and saving the fuel are achieved; meanwhile, the lubricity is improved, an engine is protected from being abraded, and the problems of the engine caused by harsh work environments in altitude regions are radically and completely changed.