The invention relates to the field of functional beverages, and discloses a beverage capable of improving intestinal functions and a preparation method of the beverage. The health-care food is prepared from the following raw materials in parts by weight: 150 to 300 parts of ginseng, 150 to 300 parts of fried white hyacinth bean, 150 to 300 parts of poria cocos, 150 to 300 parts of pericarpium citri reticulatae, 150 to 300 parts of honey-fried licorice root, 0 to 1000 parts of polydextrose, 400 to 700 parts of xylooligosaccharide, 0 to 3000 parts of lactobacillus fermentation liquor, 0 to 30 parts of lactobacillus plantarum L-137, 100 to 1000 parts of erythritol, 0 to 0.4 part of stevioside, 0 to 0.2 part of sucralose, 0 to 200 parts of probiotic powder and 0 to 400 parts of resistant starch. According to the functional beverage, the probiotics/prebiotics and the traditional Chinese medicine components are combined and jointly act to synergistically exert the intestinal tract protection function, even if the probiotics/prebiotics cannot smoothly enter the intestinal tract due to different human body constitution reasons, the environment in the intestinal tract can be adjusted through the action of the traditional Chinese medicines, and the effective action of the functional beverage is ensured.