Preparation method and applications of grape concentrated juice for preparing tobacco spice

The invention relates to a preparation method and applications of a grape concentrated juice for preparing tobacco spice, and belongs to the technical field of tobacco spice production. The preparation method comprises the following steps: peeling and denucleating fresh grapes, juicing, carrying out primary filtration, carrying out centrifugal treatment on the filtrate, taking the supernatant, andrefrigerating the obtained grape juice for later use; and carrying out ultrafiltration on the obtained grape juice by adopting an ultrafiltration membrane, taking the permeate liquid, and carrying out forward osmosis concentration at a concentration degree of 30-50 DEG Brix to obtain a grape concentrated juice. According to the invention, the grape concentrated juice contains sweet taste, moisture retention, smoking taste improvement and other components for improving cigarette quality, has good harmony with cigarette fragrance, and can enrich the cigarette fragrance, supplement the fruity flavor and flowery flavor o