The invention discloses a preparation method of a traditional Chinese medicine for treating upper-elimination type diabetes, which belongs to the technical field of preparation methods of traditional Chinese medicines. At present, infusion or oral medicine is generally used to treat diabetes. Long-term use is prone to drug resistance, and the curative effect is not obvious. The technical scheme of the invention is as follows: take 4.5 grams of Coptidis root, 12 grams of Scutellaria baicalensis, 9 grams of Tianhuafen, 9 grams of Anemarrhena, 12 grams of gypsum, 6 grams of Shegan, 12 grams of brocade lanterns, 9 grams of mountain bean root, 12 grams of green fruit, fig 9 grams, 6 grams of gardenia, 15 grams of double flowers, 12 grams of dandelion, 12 grams of Daqingye, 12 grams of isatidis, 9 grams of Patrinia, 12 grams of raw ground juice, 9 grams of asparagus, 9 grams of Ophiopogon japonicus, white Put 18 grams of chrysanthemum root, 18 grams of reed root, 6 grams of ginger juice and 9 grams of licorice. Soak the above-mentioned traditional Chinese medicines in water, then decoct them with slow fire, and finally make a traditional Chinese medicine liquid for treating upper-elimination diabetes. Its advantages are: after oral administration, the curative effect of the medicine is long-lasting and stable, it is not easy to rebound, and it can relieve diabetes.