Preparation method of black tea with sweet potato leaves

The invention provides a preparation method of black tea with sweet potato leaves. The black tea is prepared from sweet potato leaves with relatively high tenderness at the top ends of seedling stems on the ground when sweet potatoes are ripe in summer and fall; with a black tea preparation process, the preparation method comprises the steps of picking, withering, rolling, fermenting (for extracting fragrance), shaping and drying by virtue of high-temperature combination of microwave. The prepared black tea with the sweet potato leaves has black bloom and glossy appearance, is sweet in taste, pure and fresh in fragrance, red and bright in brewing soup color, has apertures and is refreshing in taste and sweet in aftertaste; the active substances in the sweet potato leaves are fully retained in the black tea; the prepared black tea with the sweet potato leaves has the health functions of resisting oxidation, reducing blood sugar and enhancing immunity.