The invention relates to a cereal meal replacement stick for fat loss and a preparing method thereof. The cereal meal replacement stick is prepared from concentrated whey protein, calcium caseinate, soybean isolate protein, hydrolysis fish collagen, konjac flour, psylliumseedhusk powder, a white kidney bean extract, a potato extract, conjugated linoleic acid glyceride powder, DSM fabuless palm oilpowder, freeze-dried fruit powder, beet juice powder, mixed cereal powder, mixed tocopherol concentrate, active probiotic powder, a compound nutrient supplement, freeze-dried fruit particles, nut grains, chia seeds, puffing cereal particles, puffing soybean protein grains, isomalto-oligosaccharide, fructo-oligosaccharide, resistant dextrin, glycerinum and high-oleic-acid sunflower seed oil. The preparing method specifically comprises the following steps of syrup boiling, material mixing, forming, cooling, cutting and coating or non-coating. The meal replacement stick has the advantages of energy negative balance, strong satiation, low sugar increase and full nutrition, and the health and vigor of the body are guaranteed while dieters lose weight and fat.