NOVELTY - The anaerobic fermentation device comprises a raw material pre-mixing and adjusting device (1), a feeding screw conveyor (2), a sliding sealing device (3), a horizontal rotating cylinder chamber (4) and a discharging screw conveyor (5). The feeding screw conveyor, the horizontal rotating cylinder chamber and the discharging screw conveyor are connected in series and coaxially mounted. The raw material pre-mixing and adjusting device is fixed on the feeding screw conveyor.    USE - The fermentation device is useful for producing marsh gas.    ADVANTAGE - The device avoids bio-gas slurry and secondary pollution.    DETAILED DESCRIPTION - The anaerobic fermentation device comprises a raw material pre-mixing and adjusting device (1), a feeding screw conveyor (2), a sliding sealing device (3), a horizontal rotating cylinder chamber (4) and a discharging screw conveyor (5). The feeding screw conveyor, the horizontal rotating cylinder chamber and the discharging screw conveyor are connected in series and coaxially mounted. The raw material pre-mixing and adjusting device is fixed on the feeding screw conveyor. A feeding end of the horizontal rotating cylinder chamber and the feeding screw conveyor are connected with each other. A joint between the discharging screw conveyor and the discharging end of the horizontal rotating cylinder chamber is provided with a sliding sealing device. The feeding screw conveyor comprises a round pipe shell and pushing spiral blade material welded on a rotating shaft. A blade is arranged on front and rear sections of the feeding screw conveyor whose middle part is provided with a blade-free section and a guide sleeve. An axial line and a horizontal plane of the fermentation device form a certain angle. An inner wall of the device is provided with a shoveling plate. Ends of a round head with a round hole are connected to the feeding screw conveyor and the discharging screw conveyor, respectively through a round hole of the horizontal rotating cylinder chamber. The coaxial line of the horizontal rotating cylinder chamber is greater than the axial line of the feeding screw conveyor. The sliding sealing device comprises a support saddle, a pressing cover, a sliding sealing body. The support saddle is fixed on a horizontal rotating cylinder chamber. A central line of the horizontal rotating cylinder chamber and an annular sliding seal body are installed on a base. A surface of the horizontal rotating cylinder chamber is tightly pressed on a spiral shell to form a sealed circle. The sliding sealing body is provided with a sliding space. The pressing cover is fixed on a side plane. The sliding seal body is fixed on a head of the support saddle along rotation of the horizontal rotating cylinder chamber.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of anaerobic fermentation device.    Raw material pre-mixing and adjusting device (1)    Feeding screw conveyor (2)    Sliding sealing device (3)    Horizontal rotating cylinder chamber (4)    Discharging screw conveyor. (5)