The invention discloses nano-silicon oxide morpholine fatty acid salt fresh-keeping fruit wax used in mango, which aims to solve the problems that the prior art has poor fresh-keeping effects and high cost, and is not suitable for mechanized operation. The morpholine fatty acid salt fresh-keeping fruit wax comprises the following raw materials: 20 to 30 parts of morpholine fatty acid salt, 60 to 100 parts of raw wax, 10 to 30 parts of ethanol, 5 to 15 parts of propylene glycol, 5 to 15 parts of glycol, 1 to 2 parts of sodium dehydroacetate, 5 to 20 parts of emulsified dispersion solution of nano-silicon oxide (SiOx), 5 to 30 parts of Ph regulator, 800 to 900 parts of water, and 50 to 200ppm of plant growth regulator. The nano-silicon oxide morpholine fatty acid salt fresh-keeping fruit wax has the advantages that the fruit wax has good cere flexibility and adhesiveness and does not cause surface whitening; meanwhile, the fruit wax reduces moisture dissipation and prevents microbial infection, thereby lowering rotting rate and morbidity and prolonging storage time; and therefore, the fruit wax can be used in manual film coating or mechanical waxing, and can also be used as release carrier of bacteriostatic agent and bactericide.