The invention belongs to the technical field of traditional Chinese medicines, and particularly discloses a traditional Chinese medicine composition for treating type II diabetes mellitus and a preparation method of the traditional Chinese medicine composition. The traditional Chinese medicine composition is prepared from ginsenoside, rhizoma atractylodis macrocephalae, radix rehmanniae, radix astragali, rhizoma dioscoreae, rhizoma phragmitis, radix ophiopogonis, fructus schisandrae, fructus lycii, rhizoma alismatis, poria cocos, radix puerariae, rhizoma anemarrhenae and fructus corni. The traditional Chinese medicine composition has the effects of tonifying qi and yin, tonifying the spleen and kidney, clearing heat for promoting salivation, and promoting blood circulation to remove blood stasis. Pharmacodynamic researches show that after the traditional Chinese medicine composition intervenes in a type II diabetic db/db mouse, the basic blood glucose value of the mouse can be remarkably reduced, the phenomena of polydipsia and polyphagia are improved, the glucose tolerance is improved, the serum insulin level, the glycosylated hemoglobin level and the total cholesterol level are reduced, and the curative effect is not remarkably different from that of an independent clinical medicine. Therefore, the traditional Chinese medicine composition can be used as the clinical independent medicine and has value of treating the type II diabetes mellitus.