An agent for promoting hair growth and a preparation method for the same are provided. The method for preparing an agent for promoting hair growth that includes: (1) preparing an extract from eight medicinal herbs combined together at an optimal combination ratio to contain 50 to 70 wt. % of Rumex japonicas HOUTT, 3 to 6 wt. % of Pleuropterus multiflorus, 1 to 2 wt. % of Radix Notoginseng, 1 to 2 wt. % of safflower (Carthamus tinctorius L.), 1 to 2 wt. % of Cnidium officinale, 0.5 to 1 wt. % of Mentha Arvensis var. Piperascens, 0.5 to 1 wt. % of Asarum sieboldii, and 0.5 to 1 wt. % of Glycyrrhiza uralensis Fischer； and (2) adding 10 to 15 wt. % of a purified horse fat to the extract. The present invention exhibits the remarkable effects of promoting hair growth, preventing hair loss, and providing skin care functions through the treatment of the underlying diseases, such as kidney infection, heart problems and liver disorders, that are in direct and close relation to hair loss, and by promoting blood circulation and metabolic activity.
