The invention discloses a traditional Chinese medicine for treating postpartum retained fetal membranes of cows. The traditional Chinese medicine is characterized in that a preparation method comprises the following steps: weighing the following medicinal raw materials in parts by weight: 40-50 parts of motherwort herb, 35-40 parts of Chinese angelica, 35-45 parts of prepared rhizome of adhesive rehmannia, 35-40 parts of white paeony root, 25-30 parts of peach seed, 15-20 parts of safflower, 20-30 parts of szechuan lovage rhizome, 25-35 parts of codonopsis pilosula and 20-30 parts of honey-fried liquorice root; uniformly mixing, crushing by using a crushing machine to obtain medicine powder of which the particle size is 50-100mu m, mixing the medicine powder with boiling water according to a mass ratio of (1:3.5) to (1:4.5) to obtain liquid medicine, cooling to 35-40 DEG C, then weighing yellow wine according to the mass ratio of the medicine powder to the yellow wine being (1:0.8) to (1:1.2), adding the yellow wine into the liquid medicine, and uniformly mixing and stirring to obtain a medicament. The traditional Chinese medicine disclosed by the invention is low in cost and wide in material source, is a pure traditional Chinese medicine combination agent, does not have medicine residues, is significant in curative effect, is safer and more efficient when used for treating postpartum retained fetal membranes of the cows according to a conservative treatment method mainly based on traditional Chinese medicines, ensures that the treatment effect is better than that of a conventional surgical dissection method, has the characteristics of complete fetal membrane discharge, high cow recovery speed and no sequelae, and ensures that the effective rate for postpartum retained fetal membranes of the cows can reach 90% and the cure rate can reach 80%.