The invention discloses a medicament for treating vaginitis and erosion of cervix and a preparation method thereof, belonging to the technical field of the combination of Chinese medicine and western medicine. The medicament is prepared from the following raw materials in parts by weight: 60-800 parts of oxytetracycline powder, 30-400 parts of borneol and 30-400 parts of borax. The preparation method comprises the following steps: firstly, respectively grinding the oxytetracycline powder, the borneol and the borax into medicinal powder; secondly, weighing the medicinal powder of the borneol, the medicinal powder of the borax and the medicinal powder of the oxytetracycline powder in proportion, and evenly mixing; and finally, weighing half of the evenly mixed medicinal power, sub-packaging by utilizing a short and fat capsule to obtain a granular capsule, and bagging the rest of the medicinal powder by utilizing a medicinal plastic bag. The medicament disclosed by the invention has the advantages of good curative effect, rapid curative effect, low cost and small possibility of relapse and the like. The medicament is suitable for treating bacterial vaginosis, trichomonas vaginitis, moniliform bacterial colpitis, senile vaginitis, infantile vaginitis and the like, and has the effects of diminishing inflammation and relieving the cervicitis, cervical erosion and the like.