The invention belongs to a hard nourishing and blackening Chinese medicinal herb, and particularly relates to an herbal hair blackening fluid capable of avoiding white hair and blackening hair. A preparation method of the herbal hair blackening fluid comprises the following steps of: smashing red flower, angelica sinensis, lithospermum, cactus, flos caryophylli, fructus liquidambaris, carbonized hair, ligusticum wallichii, frankincense, turmeric, wild ginger, spina gleditsiae, the root of red-rooted salvia, caulis spatholobi, jujube kernel, tuber fleeceflower stem, polygala tenuifolia, gastrodia elata, borneol, ginseng, astragalus mongholicus, Chinese yam, honey, polygonum multiflorum, donkey-hide gelatin, rhizoma polygonati, the fruit of Chinese wolfberry, semen sesami nigrum, black soya bean and mulberry; putting the smashed medicaments into a storage container to be brewed by 60% edible alcohol, and sealing and storing for 5 months; and unsealing, and bottling to obtain the product. The liquid medicine provided by the preparation method is externally used for wiping and coating the white hair parts, deeply permeates into the cortex due to the principle of cutaneous penetration, and activates the hair female cells, so that the active ingredients of the melanin in the Chinese medicinal herb can directly enter into hair follicles, and therefore, the hard nourishing and blackening Chinese medicinal herb has a certain effective effect for the juvenile canities and the young and middle-aged premature graying hair, and is removable in effects for reducing the white hair of the aged and controlling the spread of white hair.