The invention relates to a traditional Chinese medicine composition for preventing miscarriage of pregnant sows and a preparation method thereof. The composition is prepared from the following traditional Chinese medicine raw materials: Chinese angelica, prepared rehmannia root, Szechuan lovage rhizome, codonopsispilosula, fried milkvetch root, fried largeheadatractylodes rhizome, tangerine peel,argy wormwood leaf, baical skullcap root, poria cocos, indigowoad leaf, isatidis root, licorice root, white peony root, eucommia bark, Chinese dodder seed and honeysuckle flower. Various components inthe composition are proportioned according to an appropriate proportion, and match with one another. The traditional Chinese medicine composition has the characteristics that the raw materials are easy to obtain, the preparation is simple, the cost is low, and the composition is economical and practical. The traditional Chinese medicine composition provided by the invention has a main effect of benefiting qi and nourishing blood, and also has the functions of invigorating spleen and kidney, nourishing sources to stabilize Chong-Ren, and eliminating pathogenic toxins. Test data of miscarriageprevention results of the pregnant sows show that the traditional Chinese medicine composition is high in safety, reliable in curative effect, and significant in effect. To sum up, the formula of thetraditional Chinese medicine composition, provided by the invention, has the characteristics of being efficient, low in price, and safe in miscarriage prevention of the pregnant sows.