The invention discloses a medicine for treating hyperplasia of mammary glands with stagnation of liver stagnation and phlegm and a preparation method thereof, wherein the medicine comprises the following raw materials: Toosendan, August Zha, Rhizoma Cyperi, Bergamot, Lvca Plum, Lathyrus arborescens, Sorrel Luozi, turmeric, turmeric, salvia miltiorrhiza, chinensis, buliuxing, frangipani, lingxiaohua, zedoary, scalloped lily, mountain betel, pangolin, xinta flower, Hericium erinaceus, polygala, acacia bark, rock cabbage, Dwarf ground tea, corrugated seeds, geranium yellow, uncaria. The beneficial effects of the invention are: the medicine of the invention has the effects of soothing the liver and relieving stagnation, resolving phlegm and resolving stagnation, and is mainly used for the syndrome of hyperplasia of mammary glands due to stagnation of liver and phlegm. Utilize traditional Chinese medicine theory, pay attention to the overall concept, regulate the generation and operation of the body's qi and blood, and at the same time treat based on syndrome differentiation. According to different clinical manifestations, focus on treatment, quick effect, wide range of drug sources, low price, simple preparation, convenient administration route, easy for patients Accepted, clinical marketing can be carried out.