The invention relates to a medicine for treating endometriosis, in particular to a Chinese medicine oral decoction for treating endometriosis, which is prepared by using Chinese herbal medicines as raw materials. The invention adopts the technical scheme that the Chinese medicine oral decoction comprises the following raw medicinal materials in parts by weight: 5-15g of Chinese angelica, 5-15g of salvia miltiorrhiza, 3-12g of rehmanniae praeparatum, 5-15g of crude pollen typhae, 1-5g of dragon's blood, 3-12g of India madder roots and 1-5g of pseudo-ginseng powder. In the invention, all the raw medicinal materials are reasonably mixed to achieve the efficacies of promoting blood circulation and removing blood stasis, stopping pain, removing heat from the blood and stopping bleeding, calming the mind, relaxing bowel, and the like. Through the synergistic effect, the Chinese medicine oral decoction can treat both principal and secondary aspects of endometriosis, and has no side effect. By oral administration, the Chinese medicine oral decoction can regulate inner body, strengthen the body resistance to consolidate the constitution, regulate endocrine disturbance, enhance immune functions of human bodies, balance yin and yang, restore the Zang-Fu functions in dynamic balance, and effectively treat endometriosis. The invention has the advantages of obvious effect, economy, practicability and simple method, and can be operated independently. The invention is mainly applicable to patients with endometriosis accompanied with menorrhagia.