The invention discloses a method for preparing a dendrobium beverage. According to the method for preparing the dendrobium beverage, dendrobium candidum is taken as raw materials, and the dendrobium beverage is prepared and obtained through the processes of crushing, high-pressure homogeneous extraction, clarification, material blending, high-pressure homogeneous mixing, degassing and filling sterilization in sequence. According to the method for preparing the dendrobium beverage, by means of optimization of technological parameters, the original nutrition and flavor of the dendrobium are reserved, and the quality of beverage products is improved; the dendrobium beverage is sweet and sour refreshing, rich in flavor, light green in color and pure in taste, contains rich dendrobium polysaccharides, effective constituents such as mannose and amino acid, and nutrient substances such as vitamins and mineral substances, has high healthcare functions and medical value, and can nourish yin, beautify, change the color and luster of the skin, resist aging, and prolong life when drunk for a long period of time. The dendrobium beverage is stable in product quality, free of sedimentation and layering in long-period storage at room temperature, stable in state, and long in shelf life.