Preparation method of fast-dissolved purple sweet potato powder

The invention relates to a preparation method of fast-dissolved purple sweet potato powder. The preparation method is characterized by comprising the following processing steps of: (1) washing to remove sediment impurities on the surface of the purple sweet potato, and removing the peel; (2) placing the purple sweet potato into a steamer to cook in steam; (3) pulping the cooked purple sweet potato to obtain the purple sweet potato pulp, and grinding into size; (4) adding Beta-cyclodextrin to the purple sweet potato size, and uniformly mixing; (5) homogenizing the purple sweet potato size; and (6) concentrating and drying: concentrating the purple sweet potato size by a rotary evaporator for 60 to 120 minutes at concentration temperature of 95 to 105 DEG C until the mass concentration of the purple sweet potato is 36 to 40%; spraying and drying for 1 to 2 hours at 120 to 170 DEG C, and thus obtaining the fast-dissolved purple sweet potato powder. The fast-dissolved purple sweet potato powder provided by the invention is natural, healthy, good in taste, and uniform in color and luster, and has a certain healthcare effect.