Silk protein fiber is rich in hydrophilic factors such as amino groups and amine groups. It has extremely strong hygroscopicity and can regulate skin moisture and keep skin clean. Silk fiber with a protein content of up to 97% contains 18 amino acid components similar to human skin, 8 of which are essential amino acids for the human body, which can increase the vitality of epithelial cells, avoid hardening of blood vessels, and nourish the skin.