Improved anaerobic fermentation system

The utility model belongs to a fermentation device, and particularly relates to an improved anaerobic fermentation system. The device comprises a tank body, a feeding device, a gas treatment device and a stirring device, a feeding port, an observation port, a discharging port, a gas production port and a manhole are formed in the tank body, a temperature and ORP sensor communicated with the interior of the tank body is arranged on the tank body, and the action execution end of the stirring device is arranged in the tank body; the stirring device comprises a rotating body consisting of two rotating hyperboloids of which the bottom surfaces are attached to each other; the stirring blades are distributed on the surfaces of the two rotating hyperboloids in a spiral face with the same rotatingdirection, the top of a middle shaft of the rotating body is connected with power output of a rotating motor, the rotating motor is connected with the inner wall of the tank body through a connectingbase, and the connecting b