The invention discloses a white tea and a processing method thereof. The processing method comprises the following steps: (1) picking fresh leaves; (2) indoor combined withering: alternately carrying out indoor illumination withering and indoor natural withering: performing indoor illumination withering at first, adjusting the illumination strength in a range of 8500 to 21000 lux, controlling the illumination time in a range of 20 to 50 minutes in each time, then performing indoor natural withering, controlling the time in a range of 4 to 12 hours for each time, and repeating the indoor combined withering for 3 to 7 times, wherein the final water content of withered leaves is 18 to 28%; (3) carrying out vacuum low-temperature drying until the water content is in a range of 3.0 to 5.5%. The provided processing method is not influenced by the climate, a stable and controllable environment is provided for the manufacturing of high quality white tea, the quality and stability of white tea can both be improved, and the produced white tea has the advantages of bright and green luster, long-lasting fragrance, mild, thick, smooth and tender taste, immediately settles by brewing, can be brewed for many times, and brings pleasure feeling to people.