The invention discloses a medicinal composition for treating diabetes. The medicinal composition consists of astragalus, gardenia, Szechuan lovage rhizome, siberian solomonseal rhizome, finger citron, root of red-rooted salvia, cinnamomvine, swordlike atractylodes rhizome, white paeony root, perilla fruit, kudzuvine root, fragrant solomonseal rhizome, oyster shell, rehmannia root, Chinese angelica, common anemarrhena rhizome, honeysuckle flower, heartleaf houttuynia herb, fresh imperata root, Chinese caterpillar fungus, semen nelumbinis, siberian solomonseal rhizome, cornus fruit, prepared rehmannia root, villous amomum fruit, liquoric root, medlar, asparagus, black sesame, tuckahoe, cherokee rose fruit, cistanche deserticola, angelica dahurica, adenophora, dark plum fruit, complanate astragalus seed, cassia seed, mulberry leaf, fresh reed rhizome, mint, oriental waterplantain rhizome, wrinkled gianthyssop herb and parslane herb. The medicinal composition can control the blood sugar level of various patients who suffer from the diabetes and improve the clinical symptoms of diabetes complications effectively. Therefore the medicinal composition can be used for treating the diabetesand the diabetes complications such as diabetic gastroparesis, diabetic nephroma, diabetic foot, diabetic neuropathy, diabetic eye diseases and diabetic pruritus and the like.