The invention discloses a coconut water whey protein sports beverage and a preparing method thereof. The preparing method includes the following steps of firstly, mixing whey protein isolate and water, and conducting cooling to obtain material liquid A; secondly, adjusting the pH value of the material liquid A through an acidity regulator to obtain material liquid B; thirdly, mixing a sweetening agent, a stabilizer and the material liquid B, and conducting cooling to obtain material liquid C; fourthly, adjusting the pH of the concentrated coconut water through an acidity regulator, mixing thecoconut water with the material liquid C, and conducting homogenizing, sterilizing, cooling and filling to obtain the beverage. The prepared coconut water whey protein sports beverage is fresh in taste and moderate in sweetness; the content of the coconut water is 50-60%, the content of the whey protein is 1.0-2.0%, no fat exists, isomaltulose is specially added, the requirement for balancing thewater, energy, protein and electrolytes is met, and the problem that whey protein is prone to degeneration in the hot processing process due to the complicated mineral elements of the natural coconutwater is solved.