The invention discloses a Chinese medicinal preparation for treating diabetes, belonging to the field of medicines. The raw materials of active ingredients of the Chinese medicinal preparation consist of rhizome of Chinese asystasiella, yam, fruit of Thatch screwpine, litsea glutinosa, aralia chinensis, herb of rose glorybind, Chinese ladiestresses root, spirulina platensis, herb of Chinese mesona, leaf of cluster mallow, purple hypoestes herb, running mallow root, rhizome of whorledleaf solomonseal, stem and leaf of hedge glorybind, yew and herb of rough melic. The Chinese medicinal preparation has the effects of reinforcing qi, nourishing yin, promoting secretion of salvia or body fluid, clearing heat and lowering blood sugar, has an obvious treatment effect on phenomena of deficiency of vital qi such as lack of energy, tiredness, puffiness, weakness, or weight loss, thick tongue or teeth mark, is prepared from pure traditional Chinese medicines, has low toxic or side effect, can be used for treating both symptoms and root causes, can effectively control the blood sugar and the urine sugar to restore the functions such as strength and energy, has a certain recovery effect on pancreatic tissue damage, and has the characteristics of obvious curative effect, no relapse after cure, low cost, safety and stability.