A Siraitia grosvenorii-prebiotics-chrysanthemum instant tea beverage and a preparation method therefor. The instant beverage comprises Mogroside V, a chrysanthemum extract, prebiotics, a black rice extract, a black tea extract, a white kidney bean extract, a water-soluble dietary fiber, a sugar alcohol, a theanine of tea leaves, vitamin B and vitamin C. The preparation method comprises the following steps: (1) preparation of a binding liquid: uniformly blending the raw materials Mogroside V, vitamin B and the vitamin C, adding water for dissolution, and performing filtration to obtain the binding liquid; (2) blending and granulation: sufficiently and uniformly mixing the other raw materials, and then putting them into a granulator and adding the binding liquid obtained in the step (1), performing granulation, drying, and screening.
