The invention relates to a preparation method of a sophora flower health-care drink, and belongs to the field of agricultural product processing. The preparation method comprises the steps that sophora flowers, cordate houttuynia and snow pears are selected as main raw materials, the sophora flowers are dried and smashed, water is added into the sophora flowers for high-temperature extraction, filtering is performed, and a sophora flower extracting solution is obtained; the cordate houttuynia is dried, smashed, subjected to ultrasonic deodorization and high-temperature hot water extraction and filtered to obtain a cordate houttuynia extracting solution; peel and kernels of the snow pears are removed, the snow pears are juiced through a juice extractor, filtering is performed, and snow pear juice is obtained; the sophora flower extracting solution, the cordate houttuynia extracting solution and the snow pear juice with the same amount are mixed and then clarified through gelatin and bentonite and are centrifuged, white granulated sugar, honey, citric acid and ethyl maltol are added into the mixture to be mixed, and the product is bottled and sterilized to obtain the finished product; the raw materials are easy to obtain, matching is reasonable and the technology is simple; the prepared sophora flower health-care drink is clear and bright, pleasant in fragrance and unique in taste, and has the health-care effect.