The invention relates to a preparation method of a traditional Chinese medicine for treating hyperlipemia caused by overeating mutton, belonging to the technical field of preparation methods of traditional Chinese medicines. The existing method for treating hyperlipemia caused by overeating mutton generally adopts lipid regulators, and has the defect of great toxic and side effects. The technical scheme is as follows: the preparation method comprises the following steps: taking berberis root, isatis leaf, garden euphorbia herb, Aster ageratoides, radix sophorae subporstratae, lance asiabell root, huperzia serrata, Stephania japonica, barberry, thymifoious euphorbia herb, puffball, Radix et Rhizoma Thalictri, Hibiscus mutabilis, common lantana, herba orostachyos, Patience Dock Root, ilex pubescens, bracken, Ailanthus altissima Swingle, Chinese Iris Seed, verbena, Soda-apple Night-shade Herb, tartarian buckwheat root, Filliform Cassytha Herb, fig, versioolor swallowwort root, solanum lyratum thunb, anemone, oldenlandia, figwort, japaness St. johnswort, Ardisia crenata, emilia sonchifolia, Fructus Forsythiae, medicated leaven, licorice and the like; and soaking the traditional Chinese medicines in water, decocting with soft fire, and filtering to remove slag to obtain liquor, thereby obtaining the traditional Chinese medicine for treating hyperlipemia caused by overeating mutton. The prepared traditional Chinese medicine has the advantages of small toxic and side effects, short treatment course and high cure rate.