Black tea is a kind of tea made by full fermentation (the degree of fermentation is more than 80%). It is refined by typical processes such as rolling, fermenting, drying, etc. with new tea leaves suitable for the production of this product as raw materials. Black tea contains many kinds of vitamins, and its leaves and soup are red. It has the functions of refreshing and eliminating fatigue, promoting body fluid and clearing away heat, and it is also diuretic, anti-inflammatory and bactericidal.