The invention relates to a preparation method for a high-strength sports beverage. The preparation method comprises the following steps: 1) taking a proper amount of purified water, heating to 95+/-2 DEG C, adding maltodextrin, kieselguhr and activated carbon, cooling to 87+/-2 DEG C, keeping the temperature for 25-30 minutes, and then adding high fructose corn syrup, keeping the temperature at 87+/-2 DEG C for 1-3 minutes, and lastly, circularly filtering and cooling and then pouring into a blending jar; 2) adding taurine, gamma-aminobutyric acid, L-carnitine, vitamin VB6, sodium salt, sylvite and magnesium salt into hot water at 70-90 DEG C, fully dissolving, standing for a half hour and filtering; 3) uniformly mixing the two solutions, adding essence and uniformly stirring; 4) performing super-high temperature instant sterilization; and 5) filling, closing the cover and cooling, thereby acquiring the finished products. The compound sports beverage prepared according to the preparation method provided by the invention contains L-arginine and gamma-aminobutyric acid and is beneficial to the maintaining of blood glucose level in sports, the increasing of muscle glycogen storage, the increasing of exercise tolerance and the boosting of body health.