The invention belongs to the technical field of beverage processing, and specifically relates to pomelo tea and a preparation method thereof. Specifically, the invention provides pomelo tea comprising the following components, a pomelo raw material, malt syrup, a black tea extract, honey and citric acid. In order to overcome the defects that in the prior art, a product is abnormal in flavor, bitter, and poor in mouthfeel, and damage to nutritional ingredients and natural flavor is serious, a cell wall breaking technology and a fermentation engineering technology are utilized to achieve 100% utilization of whole fruits of the raw material, and especially, vitamins, mineral nutrients, bioflavonoids, polysaccharides, dietary fibers, bacterial proteins and the like rich in pomelo are retained and/or added to the utmost extent. The nutritive value and the health-care function value of a product are maximized, so as to greatly improve the high added-value of comprehensive processing of the pomelo, comply with huge market demands on safe, nutritional and health foods, and promote transformation and upgrading of traditional low-value processing of the pomelo. Moreover, the efficiency of preparation process of the pomelo tea is also improved obviously.