The invention discloses lithocarpus polystachyus Rehd health-care tea and a preparation method thereof. The tea is prepared from, by weight, 60-80 parts of lithocarpus polystachyus Rehd, 10-15 parts of broadleaf holly leaves 8-15 parts of panax notoginseng leaves, 5-10 parts of semen cassiae leaves and 6-10 parts of lotus leaves. The preparation method of the health-care tea includes the steps of raw material preprocessing, weighing and mixing, spreading and airing, fixation, rolling, fermentation, secondary fixation, drying, sterilization and packaging. The prepared health-care tea is good in flavor, good in taste, moderate in sweetness and low in calorie, and no additives are added. Meanwhile, the tea has a good tea medicine function, has the functions of reducing blood sugar and blood lipid, making people lose weight, reducing blood pressure, clearing away heat and toxin, protecting liver and kidney, resisting oxidization, delaying ageing, inhibiting and preventing cancer, improving organism immunity and the like, can be drunk for a long time, and is highly popular with mass consumers.