The invention relates to a method for preparing health tea by using sweet potatoes, which comprises the steps of picking, stripping leaves, sunning, fixing, wind drying, rolling, spraying, setting andimproving incense and dehydrating. The health tea prepared by the method provided by the invention has the advantages of tidy appearance, tight and uniform strands, green color, rich and pure aroma,good quality, clear and green tea color, clear and tender tea flavor, elegant and fragrant tea smell, fragrance, without losing the original tea flavor, easiness in drink, good boiling resistance andbalanced nutrition; the health tea has better health effect on a human body when being brewed for drinking, is refreshing and capable of stopping thirst after being drunk, has remarkable sweet after taste, is capable of clearing liver and improving vision, relaxing bowels and inducing diuresis; after being drunk for a long term, the tea also has effects of enhancing immunity, delaying senescence,clearing away the lung-heat, reducing phlegm, lubricating intestines, reducing blood press, decreasing blood sugar, preventing dyspepsia and other health effects, and greatly improves the quality of sweet potato leaf tea products.