Enzymes can efficiently and specifically accelerate biochemical reactions in biological processes. In the field of tea deep processing, the application of exogenous enzymes can be greener and more efficient in the extraction, separation, preparation, or biosynthesis of tea functional components to realize the high value utilization of tea resources. In the present review, the application of enzymes and enzyme engineering technology in tea deep processing were discussed from the following four aspects, i.e., enzyme-assisted extraction, enzyme-assisted synthesis, bioenzyme-modified tea extracts and immobilized enzyme technology. Moreover, the problems and outlooks the research directions of enzymes and the technology in the field of tea were also analyzed.