The invention discloses a caulis dendrobii blackcurrant composite beverage and a preparation method thereof, and the caulis dendrobii blackcurrant composite beverage is composed of the following raw materials by weight: 40-50 parts of caulis dendrobii, 25-35 parts of blackcurrant, 10-15 parts of kiwi fruit, 5-10 parts of watermelon peel, 5-10 parts of shaddock peel, 3-6 parts of pomegranate seed, 3-5 parts of wild jujube leaf, 2.5-4.5 parts of stevia rebaudiana, 2-4 parts of sweet broomwort herb, 1-2 parts of cushaw stem, 1.5-2.5 parts of plumeria rubra, 2-3 parts of chestnut leaf and a proper amount of water. The caulis dendrobii blackcurrant composite beverage is tasty, refreshing, sweet, sour, delicious, rich in nutrition, and high in health care value, not only can effectively supplement nutrient factors essential to human body to maintain a balanced diet, but also has the effects of clearing heat, relieving restlessness, nourishing yin, tonifying stomach, clearing intestines, moistening dryness, engendering liquid, quenching thirst and the like, relieves the sub healthy state of modern life, improves immunity of the organism, opens up a new way for deep processing of the caulis dendrobii, improve the additional value and economic benefits of the caulis dendrobii, and is applicable to large-scale production.