The invention discloses a traditional Chinese medicine composition for treating hyperplasia of mammary glands, belonging to a traditional Chinese medicine preparation. The traditional Chinese medicine composition is prepared from the following medical raw materials: 30g of oyster, 15g of sea-tangle, 15g of radix bupleuri, 15g of astragalus membranaceus, 15g of Chinese angelica, 15g of red-rooted salvia root, 15g of common peony root, 15g of white atractylodes rhizome, 10g of tuckahoe, 10g of semen trichosanthis, 10g of ligusticum wallichii, 10g of radix asparagi, 10g of rhizoma sparganii, 10g of pericarpium citri reticulatae viride and 10g of tangerine seed. The traditional Chinese medicine composition has the balancing effects of nourishing Yin, relaxing stasis, dissolving stasis, dissipating stagnation, soothing the liver, regulating the flow of vital energy and activating blood to dissolve stasis, and also has definite curative effect and quick effect. The traditional Chinese medicine composition not only greatly reduces toxic and side effects, but also overcomes the toxic and side effects brought by taking western medicine for a long time, and has obvious curative effect on mammary gland hyperplasia patients who are not cure for a long time. Proved by 90 clinical cases, the effective rate of the traditional Chinese medicine composition is 95.8 percent.