The invention provides a medicine for treating diabetes. The medicine uses ginseng, Radix Ophiopogonis, Chinese yam, Rhizoma Anemarrhenae, Ligustri Lucidi Fructus, Yetbadetajo Hert, roasted Rhizoma Atractylodis Macrocephalae, Radix Astragali, Peach Seed, Radix Paeoniae Rubra, Cortex Moutan, Medicinal Cyathula Root, Fructus Arctii, unprepared rehmannia root, Cortex Lycii and Trichosanthis Radix as raw materials, or uses ginseng, Ephedrine alkaloid, Cattail Pollen flavone, Radix Angelicae Pubescentis, beta-oleyl alcohol of Leaf of Tasmanian Bluegum, Angelica polymorpha Maxim, Radix Puerariae, Rhizoma Anemarrhenae, Ligustri Lucidi Fructus, Yetbadetajo Hert, roasted Rhizoma Atractylodis Macrocephalae, Peach Seed, Cortex Moutan, Medicinal Cyathula Root, Fructus Arctii, Radix Scrophulariae, Cortex Lycii and Herba Leonuri as raw materials, or uses ginseng, epigallocatechin gallate, Myricaria laxiflora, Angelica polymorpha Maxim, Radix Ophiopogonis, Yetbadetajo Hert, white peony root, Peach Seed, Cortex Moutan, Medicinal Cyathula Root, Fructus Arctii, Radix Scrophulariae, Cortex Lycii, Radix Scutellariae, Corsvenor Momordica Fruit and mulberry leaf as raw materials, or uses ginseng, tea polyphenol, konjak, Chaenomeles Speciosa(sweet) Nakai, Radix Ophiopogonis, Yetbadetajo Hert, Peach Seed, Chinese yam, Medicinal Cyathula Root, Cortex Moutan, Chinese magnoliavine, berberine, 3-6 parts of Radix Scrophulariae, mulberry leaf, Cortex Lycii, unprepared rehmannia root and Trichosanthis Radix as raw materials. The medicine has simple and unique formula and preparation method.