The invention discloses a Chinese medicinal external composition for curing gynecological diseases and a preparation method thereof. The composition is prepared from amur corktree bark, hairyvein agrimonia herb and bud, common cnidium fruit, climbing groundsel herb, dried alum and borneol in a certain ratio. The composition is prepared into clinically acceptable external formulations such as suppository, external capsules, gel, ointments, vaginal tablets, vaginal effervescent tablets, vaginal films, lotion, aerosol, foaming agent and the like by a pharmaceutical conventional method. The composition has good curative effects on cervical erosion, gynecological inflammation, and urinary tract infection of women. The composition is prepared into an external preparation and is not orally administrated so as to avoid first-pass effect on liver and physiological screening effects of gastrointestinal tracts and reduce untoward effect. The external preparation can directly act on afflicted parts, and has the advantages of strong pertinence, general actions through skin and mucosa, quick medicinal absorption, less interference to internal environment of body, non-traumatic treatment mode, simple operation, good safety of clinical use, high cure rate, base strengthening of Chinese medicaments, and less side effect. The composition can effectively eliminate cause of diseases, can safely and effectively cure diseases under guidance of doctors and is easy to popularize.