The invention discloses a weakly acidic hair-washing and hair-care active lotion. The lotion comprises the following components in parts by weight of 20-30 parts of radix polygoni multiflori, 20-30 parts of herba artemisiae annuae, 8-10 parts of herba ecliptae, 10-20 parts of maple leaves, 8-10 parts of radix angelicae sinensis, 8-10 parts of fructus piperis longi, 8-10 parts of pericarpium citrireticulatae, 6-8 parts of herba barleriae lupulinae, 6-8 parts of herba taraxaci, 6-8 parts of pine tree leaves,6-8 parts of cypress branches and leaves, 6-8 parts of tea bran, 6-8 parts of lemongrass, 6-8 parts of rhizoma zingiberis recens, 6-8 parts of semen sesami nigrum, 6-8 parts of black beans, 6-8 parts of raw papaya, 6-8 parts of star anise, 6-8 parts of flos caryophyllata, 6-8 parts of sapindus mukorossi gaerth and 10-20 parts of compound bacteria. According to the invention, a raw material formula is designed under the guidance of pharmacological experiments of traditional Chinese medicines, and the traditional Chinese medicines are processed through microbial growth metabolism and vital movement, so that a traditional process of frying, boiling, decocting, refining, steaming andsoaking are changed, effective components can be promoted to be fully separated, extracted, enhanced or generate new effects, and the hair quality is repaired.