The invention discloses a cosmetic and a preparation method thereof. The cosmetic is prepared from five components of A, B, C, D and E. The cosmetic is composed of thirty raw materials including deionized water, hydroxyethyl cellulose, allantoin, carbopol U20, propanediol, 1,3-butanediol, sodium hyaluronate, an aloe vera extract, a natto extract, asiaticoside, vitamin C, bisabolol, an amino acid humectant, D-panthenol, VC ethyl ether, nicotinamide, glabridin, tranexamic acid, ceramide, algal polysaccharide, glucan, dipotassium glycyrrhizinate, an epidermal growth factor (EGF), triethanolamine, isothiazolinone, essence, squalane, jojoba oil, vitamin E oil and crystal sparkling pearl powder. The cosmetic has the functions of making skins fine and smooth, brightening the skins, repairing sensitive skins, controlling oil, toning skins and modifying skin blemishes, has no side effect or no dependence, and does not threaten health of a human body.