The invention discloses a processing method of instant tea powder. The processing method comprises the following steps: crushing tea leaves, mixing the crushed tea leaves with distilled water, and then performing extraction for three times; combining extraction liquids; and performing two-time enzymolysis on the extraction liquids, and then performing ultra-filtration, reverse osmosis concentration and drying to obtain the instant tea powder. The variety quantity of aroma substances of the instant tea powder processed through the processing method is farther greater than the instant tea powder of the same kind on the market; the fragrance of the instant tea powder is pure and is approximate to that of original tea; and the instant tea powder has the liquor color of the original tea, is strong in instant performance, does not contain sediment substances, and can be directly brewed for drinking. The processing method is simple, high in operability and suitable for large-scale industrial production, and facilitates the development of the China instant tea beverage industry.