Preparation method of old tree white tea

The present invention belongs to the technical field of tea leaf processing and specifically discloses a preparation method of old tree white tea. The preparation method of the old tree white tea comprises the following steps: (1) picking is conducted: fresh single buds of old tea trees are picked; (2) withering is conducted: the fresh single buds are sequentially subjected to a natural spreadingtreatment, a fluorescent lamp irradiation treatment, a yellow light irradiation treatment, a rolling machine pressure-free empty rolling treatment, etc.; (3) drying is conducted: tea leaves are successively subjected to an artificial shaking treatment, a vacuum secondary drying treatment and a secondary drying treatment; and (4) screening is conducted. The steps of the preparation method of the old tree white tea are combined; the preparation method effectively improves shapes, color and fragrance of the old tree white tea; and the prepared old tree green tea is high in sensory quality, high in nutritional value and g