Preparation method of mulberry black tea type instant tea

The invention relates to a preparation method of mulberry black tea type instant tea, which comprises the following steps of: by taking mulberry black tea as a raw material, adding maltodextrin, wherein the mass of the added maltodextrin is 5-20% of the mass of the mulberry black tea; mixing and decocting with purified water to obtain an extracting solution; extracting repeatedly 2-5 times, combining extracting solutions, passing through an ultrafiltration membrane with molecular weight cutoff of 100000 Da, evaporating and concentrating; carrying out spay drying on a concentrated solution, drying to obtain a powder water-solubility mulberry black tea extract, i.e., the mulberry black tea type instant tea. The instant tea is rapid to dissolve without residues, has red and bright liquid color and is fragrant and sweet after taste; and active ingredients are well retained.