The invention discloses a Chinese medicinal herb for treating breast neoplasms, which consists of medicaments for external use and medicaments for oral administration. In the Chinese medicinal herb, the medicaments for external use are taken as main materials while the medicaments for oral administration are taken as subsidiary materials; the medicaments for external use are prepared by grinding and mixing the following 18 Chinese medicinal herbs: 1 to 10g of brimstone, 1 to 10g of red orpiment, 1 to 10g of yellow lead, 2 to 15g of marble, 1 to 10g of galalith, 1 to 10g of rhizoma drynariae, 1 to 10g of liquoric root, 1 to 10g of peristrophe baphica, 1 to 10g of leonurus heterophyllus, 2 to 15g of Chinese fevervine herb, 2 to 15g of rhynohophylla, 1 to 10g of memorialis hirta, 2 to 15g of long-stalked kadsura root, 1 to 10g of paniculate swallowwort root, 1 to 10g of cynanchum amplexicaule, 1 to 10g of Chinese forgetmenot root, 1 to 10g of cotton rose hibiscus leaf and 1 to 10g of grain husk leaf; and the medicaments for oral administration are prepared by decocting 2 to 15g of Chinese angelica, 1 to 10g of akebia stem, 2 to 15g of astragalus, 2 to 15g of October clematis stem, 3 to 20g of root of straight ladybell, 3 to 20g of apricot-leaved adenophora root, 1 to 10g of swordlike atractylodes rhizome, 1 to 6g of ricepaperplant pith and 2 to 15g of liquoric root in water. The suppression powder for the breast neoplasms of the invention has the characteristics of short treatment period, good treatment effect, no side effect and relapse prevention, and simultaneously, patients have no pain during treatment, and the treatment cost is low.