The invention discloses a Chinese medicament for treating breast cancer, and a preparation method thereof. The Chinese medicament is prepared from bupleurum, white peony roots, astragalus roots, tuckahoe, zedoary, bitter oranges, coix seeds, lithospermum, radix pseudostellariae, rhizoma atractylodis macrocephalae, Chinese dodder seeds, oysters, shizandra, cortex moutan radicis and liquorice. The Chinese medicament has the efficacies in soothing liver, relieving depression, softening and resolving hard mass and supporting healthy energy, and is used for treating the breast cancer with symptoms as follows: breast masses, rib distending pain, thoracic distress and discomfort, mental depression, vexation, testiness, bitter taste, throat dryness, red or little dark tongue nature, thin white fur, stringy pulse or stringy smooth pulse. The Chinese medicament has the advantages of exact therapeutic effects, relapse insusceptibility and no toxic-side effects.