Natural functional beverage and preparation method thereof

The invention discloses a natural functional beverage and a preparation method thereof. The preparation method of the natural functional beverage comprises the following steps: 5-10 percent by weight of shellfish soup conditioning fluid, 10-20 percent by weight of a herbage extract and 70-80 percent by weight of sweet water are mixed in proportion to obtain a mixed juice; citric acid, of which the weight is 0.1-0.5 percent of that of the mixed juice, is added into the mixed juice and is fully dissolved; high-pressure homogenization is conducted at 30 MPa to obtain a homogenized mixed liquid; filling and sterilization are conducted, to be specific, the homogenized mixed liquid is heated for hot filling, sealed, sterilized and cooled to obtain the natural functional beverage. The prepared natural functional beverage is clear, transparent, has moderate color, luster and aroma, is sour, sweet and tasty, purely natural and rich in nutrients, and has a healthcare function.