The invention discloses a hair thickening pharmaceutical composition. The hair thickening pharmaceutical composition is prepared from, by weight, 40-50 parts of oriental arborvitae, 40-50 parts of milkvetch roots, 10-20 parts of radix angelica sinensis, 20-30 parts of angelica roots, 10-20 parts of safflowers, 40-50 parts of prepared fleece flower roots and 40-50 parts of garden balsam stems. According to the formulation of the pharmaceutical composition, raw medicine is reasonably selected based on the traditional Chinese medicines theory, and the effects of reinforcing qi and nourishing blood and dredging collaterals and thickening hair are achieved. Effect taking is fast, and hair can be fast promoted to grow. Pharmacological experiments indicate that the pharmaceutical composition has a remarkable function of promoting hair growth, the effect is equal to that of common medicine minoxidil, toxic and side effects are avoided, and good clinical application prospects are achieved.