Method for extracting high-content epigallocatechin gallate from tea leftovers

The invention relates to a method for extracting high-content epigallocatechin gallate from tea leftovers. The method comprises the following main steps: a, extracting, b, concentrating, c, loading to macroporous adsorbent resin, d, loading to a middle-pressure chromatographic column, e, concentrating in vacuum, and f, refining. The method has the beneficial technical effects that an ethanol water solution which is friendly to equipment and environment is adopted as a solvent in all processes of extracting, separating and purifying the epigallocatechin gallate from the tea leftovers, the compatibility and the continuity are enhanced, the solvent is convenient to recover, energy consumption is reduced, and the production cycle is shortened. The yield of the one-off prepared epigallocatechin gallate product is greatly increased.