The invention discloses a food composition applicable to a diabetic. The food composition comprises the following components: tartary buckwheat, black rice, lotus roots, coix seeds, rice, oats, Chinese yams, lotus seeds, yellow corns, hazelnuts, garbanzos, rice beans, konjak, black sesame, sweet almonds, shii-take, medlar, dried mulberries, dried seedless grapes, fermented black beans, kudzu vine root powder, wheat germ powder, cinnamon powder, hawthorn powder, carrot powder, tomato powder, pumpkin powder, concentrated whey protein, camellia oil, perilla seed oil, corn oil, maltodextrin, L-carnitine, L-malic acid, xylitol and milk calcium. The invention further discloses a preparation method of the food composition applicable to the diabetic. Through reasonable formula ratio, the food composition can not only control the blood sugar, but also lose weight, improve the insulin resistance, lower the blood pressure, improve the blood lipid, prevent or delay occurrence and development of complications and improve the living quality and the health level of the diabetic.