The invention discloses a functional beverage with functions of resisting sugar, clearing dampness, reducing fat and improving immunity. The functional beverage is prepared from the following raw materials: cubilose, blood orange extract, nutrient yeast extract, concentrated whey protein powder, small molecular collagen peptide, grape skin extract, kudzuvine root extract, poria cocos extract, horseradish tree leaf powder, radish seed extract, exocarpium citri rubrum extract, kelp extract, Chinese wolfberry extract, mixed fruit and vegetable powder, fructus amomi, malt, coix seeds, composite prebiotics, probiotics, composite vitamins, composite mineral substances, monoglyceride and diglyceride fatty acid esters, fructo-oligosaccharide and resistant dextrin. The beverage disclosed by the invention is comprehensive in nutrition and scientific in proportion, the components can meet three nutritional requirements for carbohydrate, fat and protein of a human body, medium-chain triglyceride in the formula components cannot become stored fat of the human body, nutrition can be quickly supplemented to the human body without storage, and the effects of controlling weight, balancing nutrition, resisting sugar, clearing dampness, reducing fat and improving immunity are achieved.