Secondary fermentation method of black tea and fermentation house used thereby

The invention relates to a fermentation process and apparatus of black tea, in particular to a secondary fermentation method of black tea and a fermentation house used thereby. The method includes: spreading crude tea evenly in the fermentation house the bottom of which allows uniform introduction of steam; introducing steam evenly to the bottom of the crude tea spread evenly in the fermentation house so as to perform steaming until the uppermost layer of tea softens and may not be pinched apart by hand; after steaming, piling in the integrity for 8-24 hours, loosening, and drying. The fermentation house comprises a frame that is provided with walls, a plurality of steam pipes are arranged evenly at the bottom of the frame in parallel and are evenly provided with steam holes, and a breathable pad is arranged on the steam pipes. The secondary fermentation method of black tea and the fermentation house have the advantages that fermentation quantity is high, about 1 ton of tea leaves can be fermented at a time,