The invention relates to a preparation method of a traditional Chinese medicine for treating hyperlipemia caused by deficiency of both yin and yang, belonging to the technical field of preparation methods of traditional Chinese medicines. The existing method for treating hyperlipemia caused by deficiency of both yin and yang 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 Chinese date, Chinese yam, wheat, radix trichosanthis, cajan, radix psuedostellariae, Morinda officinalis, Arillus Longan, Bighead Atractylodes Rhizome, semen dolichoris album, Cordyceps, broomrape, actinolite, eucommia, fleece-flower root, flasem milkvetch seed, fructus psoraleae, caramel, fenugreek, walnut kernel, dried rehmannia, radix polygonati officinalis, white peony root, lily root, angelica, ganoderma lucidum, wolfberry fruit, carrageenin, Semen sesami nigrum, glossy privet fruit, radix asparagi, radix trichosanthis, silkie, dendrobe, Chinese holly leaf, 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 deficiency of both yin and yang. The prepared traditional Chinese medicine has the advantages of small toxic and side effects, short treatment course and high cure rate.