The invention provides a bleached lac nano fresh-keeping agent for pears, and is characterized in that the fresh-keeping agent consists of the following raw materials by 
mass percentage: 8.3-62.5 percent of water solution with 24 percent of bleached lac, 0.1-0.8 percent of 
silicon dioxide nano materials, 2.0-10.0 percent of 
pepper extract, 2.0-10.0 percent of 
stemona root extract, 2.0-10.0 percent of 
magnolia officinalis extract, 0.5-2.0 percent of 
sodium dehydroacetate, 50-200ppm of 
gibberellin and water as the allowance. The fresh-keeping agent can further improve film-forming property of the bleached lac film and air regulating performance of the film; while having good 
moisture retention, antisepsis and 
disease resistance properties, the fresh-keeping agent can selectively penetrate gases, such as 
carbon dioxide, etc., and effectively prevents fruits from being damaged by 
carbon dioxide; after being smeared with the agent for fresh-keeping, the pears can be stored for 90-100 days at normal temperature without any 
refrigeration equipment, and commodity rate is as high as 90 percent, water 
loss rate is less than or equal to 10 percent; in addition, ingredients of the fresh-keeping agent are all natural materials and food additives, thus remaining no 
toxicity residue and bringing no 
pollution to the environment.