The invention discloses a buckwheat traditional Chinese medicine preparation for treating diabetics. The buckwheat traditional Chinese medicine preparation for treating the diabetics is prepared from, by weight, 30-50 parts of malt, 40-60 parts of polygonatum odoratum, 60-80 parts of mesona chinensis, 100-120 parts of purslane, 70-90 parts of radix ophiopogonis, 130-150 parts of Chinese yams, 90-110 parts of fresh diffuse dayflower herb and 180-200 parts of buckwheat. The buckwheat traditional Chinese medicine preparation for treating the diabetics has the effects of promoting the secretion of saliva or body fluid, clearing heat, nourishing yin to lessen heat and reducing blood glucose and blood fat, has remarkable treating effect on nephrosis, a liver disease, peripheral neuropathy, ischemic cerebrovascular diseases and other symptoms caused by diabetes treatment, is appropriate in medicinal material proportion, simple in preparation, high in safety performance, free of toxic and side effects, can treat both symptoms and root causes and is good in effect and worthy of clinic and wide popularization and application.