The invention relates to the technical field of drink processing, in particular to a passion fruit drink and a preparation method thereof. The passion fruit drink is mainly prepared from passion fruits, pitaya, wax apples, endive, Jerusalem artichoke, purple lotus fruits, dark green tea, twisted-flower rush herb, phosphatidic acid, mannan, chitosan, lactobacillus fermenti, lactobacillus acidophilus, bacillus licheniformis, bifidobacterium, saccharomycetes, lactosucrose, isomaltooligosaccharide, stachyose, complex enzyme and other raw materials through raw material treatment, enzymolysis, enzyme deactivation, blending, sterilization and other steps. The raw material formula of the drink is the most scientific and reasonable, the drink has uniform color, has no precipitates, has a fragrant and strong fruit flavor, tastes mellow, refreshing, sour, sweet and delicious, has a long shelf life, has effectively increased soluble solid content, has high nutritional value, can effectively promote intestinal tract movement, has the effects of clearing heat, removing toxins, producing saliva, slaking thirst, clearing intestines, maintaining beauty and keeping young and is a functional healthcare drink capable of regulating intestinal florae and invigorating intestines and stomach, and the preparation process is simple and easy to operate.