OF THE DISCLOSURE Provided are a composition for preventing, treating or improving hair loss and a composition for promoting hair generation or hair growth, comprising a CXCL1 protein as an active ingredient, and a method using the same. The CXCL1 protein according to the present disclosure has no side effects at the time of treating hair loss and an 5 excellent hair generation effect even in a short time and thus can be used as pharmaceutical products and usefully used as quasi-drugs, cosmetics and health functional foods. 10