The invention discloses a beauty cosmetic containing collagen antioxidant peptides and a preparation method of the beauty cosmetic. The beauty cosmetic comprises the components of collagen antioxidant peptides, a cucumber extract, vitamin C, vitamin E, lecithin, glyceryl monostearate, wheat germ oil, SupGuard GM-BP, glycerin, hyaluronic acid, nanometer titanium dioxide, jasmine essential oil, pigment and the rest of deionized water. According to the invention, the antioxidant peptides obtained by carrying out enzymatic hydrolysis on collagen in fish scales are taken as a main functional component, and appropriately proportioned to prepare the beauty cosmetic containing the collagen antioxidant peptides. The preparation method of the beauty cosmetic has simple process, scientific formula, no need to invest a lot of equipments and low cost, and is suitable for industrialized mass production; the obtained product is mild in performance, cool and comfortable, and has the efficacies of resisting oxidation, protecting ultraviolet, resisting bacteria, whitening and moisturizing skin, removing free radicals in a body, delaying aging and the like. The cosmetic can be naturally covered on the skin surface, so that the skin is more fine and smooth, whiter and rich in elasticity.