The invention relates to a Chinese chestnut health-care instant beverage prepared by a freeze concentration drying method. The beverage is characterized by being prepared from Chinese chestnuts as a main raw material which contains the components in percent by weight: 37-63% of starch, 10-20% of sugar content, 9-12% of protein content and 2-7% of fat content. The beverage is prepared by the following steps: mixing the Chinese chestnut nuts and a pre-boiled solution in a ratio of 3: 5; boiling the mixture; then adding alkaline mineral water or softened water; coarsely grinding and pulping the mixture properly to prepare Chinese chestnut slurry, the concentration of which reaches 25%; and carrying out hydrolysis, fine grinding, blending and emulsification and homogenization, freezing concentration, freezing crushing, freezing lyophilizing and superfine grinding to obtain the Chinese chestnut health-care instant beverage. The beverage is a light yellow emulsion which is bright in color and luster and has a natural fresh scent of Chinese chestnuts. As chitosan and tea polyphenol are added into the Chinese chestnut beverage, the beverage can help produce saliva and slake thirst and hasa certain health-care function on human health.