The invention belongs to the field of traditional Chinese medicine, and more specifically relates to a traditional Chinese medicine composition used for treating gynecological oncology, and a preparation method thereof. The traditional Chinese medicine composition is composed of thallus laminariae, bryozoatum, radix scrophulariae, concha ostreae, spina gleditsiae, bulbus fritillariae thunbergii, rhizoma sparganii, rhizoma curcumae, licorice root, radix bupleuri, fructus aurantii immaturus, cassia twig, cortex moutan, spreading hedyotis herb, poria cocos, radix paeoniae rubra, rhizoma corydalis, pseudobulb of appendiculate cremastra, eupolyphaga sinensts, semen vaccariae, radix curcumae, and ligusticum wallichii. The preparation method comprises following steps: the above medicinal materials are mixed so as to obtain a medicinal material mixture; the medicinal material mixture is grinded into a powder; and the powder is prepared into a composition dosage form. The traditional Chinese medicine composition can be used for treating breast tumor, cystic ovarian tumor, and myoma of uterus, and is capable of avoiding operative treatment of patients.