Preparation method of old-tree black-tea

The invention belongs to the technical field of tea processing, and specifically discloses a preparation method of old-tree black-tea. The preparation method of the old-tree black-tea disclosed by theinvention comprises the following steps: (1) carrying out picking; (2) carrying out withering, namely orderly carrying out natural withering, pressure-free idling and natural withering; (3) carryingout rolling, namely putting the withered tea into a rolling machine, and carrying out three-stage rolling so as to obtain rolled tea; (4) carrying out fermentation; (5) carrying out post-fermentationtreatment, namely orderly performing red light irradiation and intermittent vacuum drying treatment; (6) carrying out drying, namely putting the tea after the post-fermentation treatment into a dryingmachine, and carrying out two-stage drying; and (7) carrying out sieving. The preparation method of the old-tree black-tea disclosed by the invention is a sustained improvement on existing black teapreparation technologies, and