Stem cell exosome preparation method, exosome prepared by method and application of exosome in skin care

The invention discloses a stem cell exosome preparation method, an exosome prepared by the method and application of the exosome in skin care. The preparation method comprises the step of culturing the human umbilical cord mesenchymal stem cells by using a complete culture medium containing the argireline. Compared with common human umbilical cord mesenchymal stem cell exosomes, the human umbilical cord mesenchymal stem cell exosome obtained by the preparation method can more effectively promote dermal fibroblasts to generate type I collagen. Collagen in human skin is mainly I-type collagen, and the I-type collagen accounts for 70%-80% of the dry weight of skin collagen and is an important basis for the skin to bear tension and keep the skin plump. And after skin aging or damage, the I-type collagen content can be obviously reduced. Therefore, the stem cell exosome obtained by the preparation method disclosed by the invention can be used for preparing skin care products for promoting the production of skin co