The invention discloses a traditional Chinese medicine composition for treating breast cancer, belonging to the traditional Chinese medicine preparation. The composition is prepared by the following crude medicines in parts by weight: 20g of yam, 20g of astragalus, 15g of tuckahoe, 15g of angelica, 15g of radix rehmanniae, 15g of bighead atractylodes rhizome, 15g of the rhizome of chuanxiong, 15gof red paeony root, 15g of donkey-hide glue, 15g of glossy privet fruit, 10g of rhizoma polygonati, 10g of south dodder seed, 10g of radix sophorae subprostratae, 10g of heartleaf houttuynia herb, 8gof agastache rugosus and 6g of red flower. The composition has the effects of inhibiting tumor and eliminating stagnation, promoting blood circulation by removing blood stasis and dredging collaterals and stopping pain, can improve the immunity of the patients, prevent spread of cancer cells, play roles of reducing toxicity and increasing effects in radiotherapy and chemotherapy, control morbidity, ease pains, improve quality of life of the patients and relieve symptoms in a short time of medicine taking. In addition, the composition is the pure traditional Chinese medicine preparation, thus having no toxic or side effects.