Preparation method of blueberry instant black tea powder

The invention relates to a preparation method of blueberry instant black tea powder. The preparation method comprises the following steps: (1) with dry tea as a raw material, adding hot water for dynamically extracting the dry tea, and then filtering tea grounds to obtain a tea soup; (2) cooling the tea soup, adding fresh blueberry pulp and performing aerobic mixing and fermenting, stopping fermentation after a period of time, and removing fruit residues by filtering to obtain blueberry and black tea juice; and (3) concentrating the black tea juice obtained by fermentation by adopting a membrane concentration technology to obtain a black tea concentrated solution, and then sequentially performing vacuum freeze drying, crushing and sieving to obtain the blueberry instant black tea powder. The preparation method is simple in steps, and easy to operate; middle and low-grade green tea or oolong is selected as a raw material, the raw material is wide in source and is not limited by seasons and regions, and the production cost is low; the instant black tea powder prepared by adopting the preparation method is stable in quality; the content of theaflavin as a characteristic substance in the instant black tea reaches up to 2.8 percent, tea water made by the blueberry instant black tea powder is red and bright in color, fresh in fruity flavor and fresh and brisk in taste, and the variety of the instant tea powder is enriched.