NOVELTY - Device comprises a feeding tube, a discharging tube, a fermentation pipe and hydraulic pressure chambers. The fermentation pipe is a linear-type pipe. The two side top part of the fermentation pipe is set with an opening and is detachably fixed to feeding tube and discharging tube. The sidewall of feeding tube and wall of discharging tube extends to fermentation pipe located below slurry liquid level. The hydraulic pressure chambers are mounted on top of fermentation pipe. A horizontal drainage pipe is located between feeding tube and the discharging tube of the hydraulic pressure chambers.    USE - The device is useful for producing methane by stirring biogas slurry circulation flow (claimed).    ADVANTAGE - The device facilitates slurry circulation flow during stirring performance; and promotes uniform distribution of bacterial species in biogas flow while stirring, and the fermentation of raw materials in deep fermentation system, and thus it improves the fermentation system performance and methane gas production capacity.    DETAILED DESCRIPTION - Device comprises a feeding tube, a discharging tube, a fermentation pipe and hydraulic pressure chambers. The fermentation pipe is a linear-type pipe. The two side top part of the fermentation pipe is provided with an opening and is detachably connected to the feeding tube and discharging tube. The sidewall of the feeding tube and wall of the discharging tube extends into the fermentation pipe located below the slurry liquid level. The hydraulic pressure chambers are mounted on the top of the fermentation pipe. A horizontal drainage pipe is located between the feeding tube and the discharging tube of the hydraulic pressure chambers. There are connections located between the horizontal drainage pipe and the discharging tube of the hydraulic pressure chambers. The fermentation pipe is provided with many air resistance plates located along the sidewall of the feeding tube and the discharging tube. The side wall of the feeding tube or the discharging tube are set with adjacent gas blocking plates provided with space between forming a fermentation zone or forming space between adjacent air resistance plate to form fermentation zone. The upper part of each fermentation zone is separately connected to a gas-guide pipe. The gas-guide pipe is provided with a valve. The methane production system further comprises an anti-bacteria fabric device comprises drain pipe. The anti-bacterial fabric device is provided with an anti-bacterial fabric pipe pore composition. The anti-bacterial fabric pipe is linear, and is located along the axial direction of a central conduit pipe which is installed in the fermentation pipe. The feeding tube is connected with drainage pipe. The drainage pipe is connected along the vertical direction of the anti-bacterial fabric pipe. The other end of the drainage pipe is connected to the bottom part of the hydraulic pressure chambers. The anti-bacterial fabric pipe is connected to many fermentation pipes located along the central axis and vertical direction of pore of the anti-bacterial fabric pipe. The feeding tube is set on the drainage tube of the hydraulic pressure chamber used for controlling the biogas unidirectional flow into a one-way valve of the feeding tube. The discharge pipe is set on the drainage pipe used for controlling the slurry flowing into a one-way check valve located between the hydraulic pressure chambers. The drainage pipe of the anti-bacterial fabric pipe extends between the inner sides of the hydraulic pressure chambers. The anti-bacterial fabric device provided with drainage pipe is located at the lowest point between one end extending towards the water pressure and higher than the level, where the discharging pipe, drainage pipe and hydraulic pressure chambers are connected to the lowest point level of the sidewall of the feeding tube. The drainage pipe and hydraulic pressure chambers are connected to the lowest point level of the feeding tube which is located at a higher than the lowest point of the position of the drainage pipe and the hydraulic pressure chambers.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the device utilized in the production of methane by stirring biogas slurry circulation flow.