The invention discloses a simplified process for preparing a
prebiotic beverage by taking a
sweetening agent and an
acidulant as extraction reagents to hydrolyze
plant polysaccharide and directly taking an extraction filtrate as a base material, and belongs to the technical field of functional beverage preparation. The method comprises the four steps of
reagent screening, extraction, blending and sterilization, wherein firstly, a
sweetening agent and an
acidulant which are allowed to be used in beverage production are adopted for preparing an extraction
reagent; mixing with sand-fixing
plant pennisetum sinese
powder, extracting at 121 DEG C, and filtering to obtain filtrate; adjusting the
flavor of the filtrate; and finally, filling and sterilizing to prepare the functional beverage which is rich in
polysaccharide and
polyphenol prebiotics and is sour, sweet and delicious. According to the invention, a
food additive is adopted to replace a traditional chemical extraction
solvent, and low-cost raw materials and a low-investment production process are integrated, so that the functional beverage with targeting intestinal health and coping with high-incidence metabolic diseases is provided, meanwhile, the remarkable price competitiveness of the product is maintained, and the synergistic improvement of economic value, nutritional support and ecological benefits is promoted.