The invention relates to a theabrownin health-caring solid beverage and a preparation method thereof and belongs to the field of foods and beverages, wherein the solid beverage includes following components, by mass: 0.2-3% of theabrownin dry powder, 1.36-2.93% of a sour taste substance, 60-95% of sugar, 1-2% of green tea powder, 0.01-0.05% of mint powder, 0.03-0.13% of edible essences and 0.7-1.5% of silicon dioxide. The sour taste substance is one or more from citric acid, malic acid or sodium citrate. The content of theabrownin in the theabrownin dry powder is 50-90%. The preparation method includes the steps of raw material treatment, raw material weighing, raw material mixing and product packaging. The solid beverage is high in biological functions of reducing blood fat and resisting oxidization, has the effects of regulating metabolism and enhancing body vitality, is unique in flavors and good in taste, is rich in nutrition, is popular among consumers, and is good in market potential.