The invention belongs to the technical field of beverage production, and particularly relates to an inflatable herbal tea beverage and a preparation method thereof. Aiming at the problems of heavy Chinese herbal medicine flavor, poor taste, multiple additives and the like of a conventional herbal tea beverage, the invention provides the inflatable herbal tea beverage which comprises the components: heat-clearing Chinese herbal medicines, a cooling agent, carbon dioxide, auxiliary materials and water. The invention also provides the preparation method of the inflatable herbal tea beverage, wherein the preparation method comprises the following steps: a, adding the heat-clearing Chinese herbal medicines and spices into water, heating to 85-100 DEG C, decocting for 20-60 min, cooling, and filtering; b, adding a fruit and vegetable juice, a sweet substance and a thickening agent, and uniformly mixing; c, adding an acidity regulator, the cooling agent, an antioxidant and an essence, uniformly mixing, sterilizing and cooling; and d, introducing carbon dioxide into the remaining water to enable the gas content of carbon dioxide to be 0.1-0.5%, and adding the obtained water into the solution obtained in the step c, so as to obtain the inflatable herbal tea beverage. The inflatable herbal tea beverage is fresh in taste, free of medicine flavor and good in taste, and the preparation method is simple to operate and suitable for promotion.