The invention discloses a herbal composition for treating alopecia seborrhoeica and a nanometer hair growing fluid. The herbal composition is prepared from the following components in parts by weight:10 to 50 parts of radix polygoni multiflori, 10 to 50 parts of Chinese angelica root, 10 to 50 parts of radix et rhizoma ginseng, 10 to 50 parts of cacumen platycladi, 1 to 15 parts of tea seed meal,and 1 to 15 parts of galla chinensis. The herbal composition also contains a nanometer emulsion. The herbal composition has the advantages that the obvious synergistic function is realized; by usingthe herbal plants as the raw materials, the compounding of the whole formula is reasonable, the obvious functions of inhibiting bacteria, inhibiting hair loss and promoting hair growth are realized, the weight and length of new hair can be increased, the hair loss can be fundamentally relieved, the effects of removing oil and dandruff, relieving itching, and solidifying hair roots are realized, the purposes of preventing hair loss and preventing healthy growth of hairs are realized, and the alopecia seborrhoeica is effectively treated; the preparation method is simple, the cost is low, and theherbal composition can be applied to various hair products; the application prospect is good.