Production method of black tea

The invention belongs to the technical field of tealeaf production and processing, and particularly discloses a production method of black tea. The production method comprises the following specific steps: natural withering: uniformly and thinly spreading picked tea leaves on a spread-cooling machine indoors to carry out natural withering, wherein the withering temperature is 25-30 DEG C, the spreading thickness is 3-5 cm and the withering time is 8-12 h so as to ensure that the fresh leaves wither uniformly and consistently; putting the naturally withered fresh leaves in a twisting machine to twist the leaves for twice, wherein the rotation speed of the twisting machine is 26-28r/min, the time of each twisting is 25-30min under natural temperature according to the principle of light force, heavy force and light force, the leaf feeding amount is 17.5-22.5kg and the water loss is 5-8%; and carrying out deblocking, primary spread-cooling, fermentation, secondary spread-cooling, shaping, primary drying, secondar