The present invention relates to an oral composition for improving skin care, which has the effects of smoothing skin and preventing wrinkles when taking the composition. More specifically, the composition of the present invention further contains one or more components selected from a group comprising elastin proteins, hyaluronic acid, and vitamin C in a collagen peptide. Especially, according to the present invention, the composition containing the collagen peptide, elastin protein, hyaluronic acid and vitamin C together in an optimized ratio does not cause side effects in the human body when taken. In addition, collagen biosynthesis of skin dermis is maximally promoted and the remaining rate in the user's body is very high. Also, the composition has the effects of suppressing wrinkles in the skin, maintaining or improving skin elasticity, and relieving dryness so it is useful as a healthy functional food for improving skin care and preventing skin aging.