The invention relates to a fresh herba houttuyniae-pear juice beverage and a preparation method thereof, and belongs to a functional beverage with dual purposes of medicament and edibility. The beverage is prepared from fresh herba houttuyniae, snowflake pear, honeysuckle, purified water, soft sugar, citric acid, and CMC-Na, wherein the weight ratio of leaves to stems of the herba houttuyniae is 3 to 1, the weight ratio of the herba houttuyniae to the water is 1 to 4, and the volume ratio of the herba houttuyniae to pear juice is 1 to 1; during the first preparation, the volume ratio of the mixed juice to the water is 3 to 4, and the added quantities of the soft sugar, the citric acid and the CMC-Na account for 2.4 percent, 0.06 percent, and 0.04 percent of the diluted mixed juice respectively; the weight ratio of the honeysuckle to the water is 1 to 80, and the volume ratio of honeysuckle brewed water to the herba houttuyniae-pear juice is 1 to 7.5; and during the second preparation, the added quantity of the soft sugar accounts for 0.926 percent of the total volume of the mixed juice. The preparation method adopts a pulping and squeezing process and pipe-type duplex filtering technology and pasteurization technology. Products prepared by the preparation method of the invention have the advantages of no obvious fishy odor or bitter taste, moderately sweet and sour, clearness, no sediments, low sugar content, and long shelf life; and the preparation method not only can preserve the original function of the herba houttuyniae, but also can solve the problem that the herba houttuyniae beverage produced by the conventional process has the disadvantages of fishy odor and bitter taste, high sugar content, difficult storage, and turbidness. The preparation method has the advantages of simple process and lower cost, and is suitable for industrialized production.