Preparation technology of tea catechins in fresh tea leaves

The invention relates to a preparation technology of tea catechins in fresh tea leaves. The technology comprises the following steps: deactivating enzymes of the fresh tea leaves, crushing, and carrying out dynamic extraction by using water saturated ethyl acetate; balancing the above obtained extract liquid and water, and using n-hexane or petroleum ether to urge tea catechins to enter a water phase in order to separate the tea catechins and fat-soluble pigment components (such as chlorophyll and xanthophylls); and extracting a lower phase obtained after separation by using ethanol-containing water saturated ethyl acetate, and further refining through enriching the tea catechins by using insoluble low-substituted hydroxy propyl cellulose to realize high-efficiency, environmental-protection and energy-saving product obtaining. The quality of the above obtained product is high.