The invention discloses a method for caring hair by using water melon peel. Multiple hair-care Chinese medicinal components are dissolved by water melon pulp, and then the water melon is aired, so the multiple hair-care components are seeped into the water melon peel, and the aired water melon peel is used for hair care. After long-term use, the hair becoming white from black due to chemical hairdye becomes black again, the dry hair becomes moist, and the hair is not easy to be broken and damaged. The method for caring hair by using Chinese medicament is simple, plays a role of the Chinese medicament, and has long quality guarantee period after hair care and good hair-care effect.