The invention discloses a body-fluid-increasing and thirst-quenching blueberry-fruit-flavor beverage. The body-fluid-increasing and thirst-quenching blueberry-fruit-flavor beverage is prepared from the following raw materials in parts by weight: 240-250 parts of blueberry fruits, 68-70 parts of mulberry fruits, 24-25 parts of oat bran powder, 40-42 parts of red kidney beans, 34-35 parts of water chestnuts, 22-23 parts of Chinese wolfberry buds, 9-10 parts of walnut kernels, 17-18 parts of seabuckthorn fruits, 30-32 parts of pagodatree flowers, 11-12 parts of celery juice, 7-8 parts of purslanes and an appropriate amount of water. The invention has the following beneficial effects: the solid beverage disclosed by the invention utilizes the blueberry fruits as the main raw material; and the preparation method comprises the following steps: firstly, extracting the health-care components which are liable to be affected by high temperature, including anthocyanin and the like, from the blueberry fruits; mixing the blueberry pulp with other raw materials, and performing pulp-grinding, homogenizing, spray-drying and the like on the mixture so as to obtain solid powder; and then, mixing the solid powder with the extracted anthocyanin so as to maximize the preservation of the nutrients in the blueberry fruits. Being brewed, the prepared final products are mellow in fruit aroma; moreover, the added food materials, including the water chestnuts, the pagodatree flowers, the purslanes and so on, have the functions of cooling and refreshing, relieving summer-heat, increasing body fluid and quenching thirst.