The invention discloses a novel technology for the dark 
green tea fermentation, and relates to a dark 
green tea fermentation method. The 
fermentation method comprises the following steps: subjecting fresh tea leaves to processes of tedding, 
enzyme inactivating, and rolling, and then placing the processed tea leaves on an auto-control 
machine to carry out 
pile fermentation; and is characterized in that the 
pile fermentation is divided into three phases: a. low-temperature fermentation: controlling the temperature in a range of 25 to 35 DEG C and the 
humidity in a range of 24 to 45%, carrying out the 
pile fermentation reactions for about 24 hours, wherein in this phase microzyme is cultured, and 
carbon dioxide is generated by the microzyme to decompose the 
caffeine in tea leaves; b. high-temperature fermentation: controlling the temperature in a range of 36 to 55 DEG C and the 
humidity in a range of 25 to 30%, carrying out the pile fermentation reactions for about 12 hours, wherein in this phase, fibers, 
pectin, and 
protein are fully decomposed into tea 
polysaccharide and glucose by various bio-enzymes, and 
catechin of tea 
polyphenol which is the main component of tea leaves is converted into 
theaflavin and thearubigins through the enzymatic action, and tea 
melanin is forbidden to be generated in this process; c. mid-temperature fermentation: controlling the temperature in a range of 32 to 39 DEG C and the 
humidity in a range of 28 to 36%, carrying out the pile fermentation reactions for about 6 hours, wherein in this phase 
lactic acid bacteria and 
bifidobacterium are generated, and then the 
lactic acid bacteria convert glucose into 
vitamin C, 
vitamin P, and a plurality of amino acids.