The invention relates to a food preservative, in particular to a special preservative for processing peaches, which comprises the following components in percentage by weight: 15+ / -1.5% of potassium permanganate, 15+ / -1.5% of alkali metal hydroxides, 6%+ / -1.0% of reducing substances, 3+ / -0.5% of alkali metal oxides, 3+ / -0.3% of cyclopropene or 1-methylcyclopropene, 2.5+ / -0.2% of sodium hypochlorite or sodium chlorate, 2+ / -0.2% of dehydrating agent, 1.5+ / -0.3% of zinc oxide, 1.5+ / -0.15% of ascorbic acid, 0.5+ / -0.05% of sodium polyacrylate, and 50+ / -5% of inorganic carriers. The special preservative for processing peaches achieves the purpose of preservation through adjusting the concentration of oxygen and carbon dioxide, and the preservation period of preserved peaches can not be shortened by the influence of water or steam, and adopted raw materials and components in the formula have the characteristics of safety, broad spectrum, high efficiency, low price and no public nuisance, therefore, the special preservative for processing peaches is suitable for industrialized mass production.