EGF exists in human epithelial cells, which can stimulate the growth of epithelial cells and endothelial cells, make new epidermal cells grow continuously, push away necrotic cortex gradually, keep skin tender and smooth, promote the metabolism of various skin cells, enhance the absorption of nutrients by cells, promote the synthesis of collagen and collagenase, secrete collagen substances, hyaluronic acid and glycoprotein, regulate collagen fibers, and have the functions of moistening skin, enhancing skin elasticity, reducing skin wrinkles and preventing skin aging. According to the good physiological characteristics of EGF, especially its activation on skin epidermal basal cells, biologists have boldly tried to apply EGF to beauty cosmetics in recent years. This kind of biological cosmetics is essentially different from traditional cosmetics. In a sense, traditional cosmetics play a more decorative role and cannot fundamentally solve skin problems. The application of EGF in beauty cosmetics is to repair and adjust cells at the molecular level according to the physiological structure of human skin, and improve or update their functions such as composition and metabolism. At present, EGF has been used as the raw material of cosmetics such as moisturizing, anti-wrinkle, whitening, skin rejuvenation and facial plastic surgery, which can promote the growth of skin cells, adjust the balance of intracellular pigments, and then create the best structure and state of skin, making skin cells younger. Many skin problems, such as relaxation, aging, wrinkles, dullness, roughness, pigmentation and acne, will be gradually improved, thus achieving the purpose of protecting the skin.