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: 4-12g of bupleurum, 4-12g of salvia miltiorrhiza, 4-12g of achyranthes, 5-15g of red paeony roots, 5-15g of pollen typhae, 5-15g of hemlock parsley, 5-15g of barbary wolfberry fruits, 5-15g of herba epimedii and 5-15g of Chinese dodder seeds. In the invention, all the raw medicinal materials are reasonably mixed to achieve the efficacies of promoting blood circulation and removing blood stasis, clearing heat and detoxicating, relieving stasis and stopping pain, removing heat from the blood and dispersing swelling, calming the mind, relaxing bowel, and the like. 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 no side effect, economy, practicability and simple method, and can be prepared independently. The invention is applicable to patients with slight endometriosis accompanied with luteal insufficiency or ovulation failure.