The invention relates to a white birch cosmetic composition and a preparation method thereof. The white birch cosmetic composition is prepared from the following raw materials according to a formula: 20 to 30 parts of white birch extract, 35 to 50 parts of cell growth factor, 1 to 5 parts of SOD (superoxide dismutase), 1 to 5 parts of active peptide, 8 to 12 parts of squalene, 6 to 10 parts of ceramide, 12 to 20 parts of carboxymethyl cellulose, 20 to 35 parts of enzyme dissolving solution, 15 to 25 parts of micro-capsule, and a proper amount of deionized water. The white birch cosmetic composition has the advantages that by adopting the micro-capsule technique, the white birch extract and the other composite components are coated, the effects of the white birch extract and the other composite components are comprehensively utilized, the white birch extract is used as an additive of cosmetic and is used for supplementing nutrients for the injured skin, and is used for assisting the acne treatment and wound restoration, the injury healing process is accelerated, and the scar and pigment are not left; the growth metabolism of the tissue cells is regulated and controlled, and the skin aging is prevented.