The utility model discloses a black tea fermentation chamber. The semicircular stirrer is fixed through the mounting column, the annular inserting groove and the lifting plate; a first bolt and a first slot are matched for use to fix the semicircular fermentation plate; air circulation in the fermentation chamber main shell is facilitated through the first through holes and the second through holes; through the fixing groove, the T-shaped iron rod, the spring and the electromagnet block, upward springing and downward shrinking of the T-shaped iron rod are flexibly regulated and controlled; a T-shaped iron rod and a second slot are matched to assist in fixing a semicircular fermentation plate; the driving motor, the belt and the rotating shaft drive the mounting column to rotate forwards and backwards; according to the black tea fermentation chamber, the semicircular fermentation plates can be taken out conveniently, it is guaranteed that the surfaces of the semicircular fermentation plates are heated evenly through the first heating plate and the second heating plate, tea is humidified through the humidifier, the fermentation temperature and humidity are relatively consistent, andthe tea can be put into and taken out of the black tea fermentation chamber conveniently.