The invention relates to whole-nutrition formula powder with ketone producing, fat reducing and sugar-resisting functions and application of the whole-nutrition formula powder. The whole-nutrition formula powder is prepared from the following raw materials: small molecular collagen peptide, whey protein concentrate powder, raw pressed coconut oil, linseed oil, glutamine, maltodextrin, fructooligosaccharide, resistant dextrin, complex minerals, decavitamin, mono/diglycerol fatty acid ester (emulsifier) and edible essence. The invention further relates to application of the whole-nutrition formula powder in preparation of functional food with ketone producing, fat reducing and sugar-resisting functions. The whole-nutrition formula powder has the advantages as follows: the whole-nutrition formula powder is scientific in formula and comprehensive in nutrient, components cover three major macronutrients including carbohydrate, fat and protein, meanwhile, all vitamins and minerals recommended by Chinese Resident Dietary Guidelines 2016 Version RNI are provided, the characteristics that MCT (medium chain triglyceride) cannot become depot fat and can rapidly supply energy to the human bodyare used, so that energy intake and storage are controlled, and the purpose of controlling the body weight is achieved.