The invention provides a grain composition for improving blood glucose. The grain composition provides dietary fibers, proteins, carbohydrates, vitamins and minerals for the human body through all thecomponents, and thereby nutritional requirements of the human body are balanced. In the grain composition, sesame seed, corn flour, tartary buckwheat, red bean, white hyacinth bean and other grains can provide carbohydrates for the human body, concentrated whey protein powder, milk powder, sea cucumber powder, soybean protein isolate powder and the like can provide protein sources for the human body, and sufficient and rich vitamins and minerals can be provided for the human body through the interaction of all the components. Effective substances, namely total flavonoids and biological polysaccharides with biological activity, contained in all the components can take auxiliary blood glucose reduction as an entry point to act together to reduce the absorption of carbohydrates and fat by the organism, reduce fasting blood glucose concentration, improve functions of islet cells, increase the sensitivity of insulin cells and the reserve of liver glycogen, lower the blood glucose level, prevent the excessive increase of postprandial blood glucose, improve glucose tolerance, and stabilize human blood glucose.