An environment-friendly airplane exterior cleanser is composed of an emulsifier, a surfactant, a solvent, an additive, a penetrant, a corrosion inhibitor, a defoaming agent, and water according to theweight ratio as follows: the emulsifier accounts for 7-10% of the cleanser, the surfactant accounts for 4-8% of the cleanser, the solvent accounts for 4-8% of the cleanser, the additive accounts for3-5% of the cleanser, the penetrant accounts for 1-2% of the cleanser, the corrosion inhibitor accounts for 0.5-1% of the cleanser, the defoaming agent accounts for 0.1-0.5% of the cleanser, and wateraccounts for 70-80% of the cleanser. The invention also provides a preparation method of the cleanser. The environment-friendly airplane exterior cleanser has good solubility on oil dirt, is easy torinse, can be applied at low temperature and is free of corrosion on metal.