The invention relates to a preparation method of a traditional Chinese medicine composition for treating thromboangiitis obliterans, belonging to a traditional Chinese medicine composition and a preparation method thereof and solving the problems of multiple components, difficult formation and high cost of the conventional traditional Chinese medicine composition for treating vasculitis.The traditional Chinese medicine composition is prepared by adopting the raw materials of astragalus root, the root of red-rooted salvia, cassia bark, Szechuan lovage rhizome, dangshen, figwort root,angelica sinensis, frankincense, suberect spatholobus stem, myth, liquorice and honeysuckle. The preparation method 1 comprises the steps of: weighting the raw materials; mixing the angelica sinensis, the Szechuan lovage rhizome and the cassia bark and adding water for soaking, extracting essential oil, recovering essential oil extract, mixing dregs of a decoction and a liquid medicine with the astragalus root, the dangshen, the figwort root, the suberect spatholobus stem, the liquorice and the honeysuckle and adding water for extracting; concentrating clear paste; wrapping by using beta-cyclodextrin; and adding a wrapped matter and the root of red-rooted salvia, the frankincense and the myrrh after crushed into fine powder into the clear paste to be stirred. The preparation method 2 comprises the steps of: weighting the raw materials, adding water for extracting and concentrating the clear paste. The traditional Chinese medicine composition has less medicine components, easy formation, small added amount of auxiliary materials, low cost, simple method and easy obtaining of the raw materials.