NOVELTY - A horizontal anaerobic reactor used for biogas generation by organic waste material solid fermentation, comprises a feeding inlet (8) set at the upper part of the horizontal shell (1) and a material outlet (9) set at the lower part of the horizontal shell; where a horizontal agitating shaft (2) is set at the middle part of the horizontal shell and the horizontal agitating shaft is connected with the electric motor (4); a circulating water cylinder (7) is connected with the horizontal shell; and a balance tank (5) is set on the upper end of the feeding inlet.    USE - The horizontal anaerobic reactor is useful for biogas generation by organic waste material solid fermentation (claimed).    ADVANTAGE - The horizontal anaerobic reactor is not only appropriate for the organic waste material with different properties but can also achieve the uniform mixing of material in the fermentation process. Moreover, the heat in it is uniformly distributed and has complete degradation of the organic material and high gas generating rate in unit effective volume. Additionally, it reduces the energy consumption in agitating.    DETAILED DESCRIPTION - A horizontal anaerobic reactor used for biogas generation by organic waste material solid fermentation, comprises a feeding inlet (8) set at the upper part of the horizontal shell (1) and a material outlet (9) set at the lower part of the horizontal shell; where a horizontal agitating shaft (2) is set at the middle part of the horizontal shell and the horizontal agitating shaft is connected with the electric motor (4) through agitating shaft connecting device (3); a positive turbine wheel (12) and a coaxial reverse turbine wheel (13) are set on the horizontal agitating shaft, or a double-head right turn worm packing auger (14) and a coaxial left turn worm packing auger (15) are set on the horizontal agitating shaft; a circulating water cylinder (7) is connected with the horizontal shell; a balance tank (5) is set on the upper end of the feeding inlet; and the balance tank is connected with a gas collecting cylinder (6).    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the horizontal anaerobic reactor used for biogas generation by organic waste material solid fermentation.    Horizontal shell (1)    Horizontal agitating shaft (2)    Agitating shaft connecting device (3)    Electric motor (4)    Balance tank (5)    Gas collecting cylinder (6)    Circulating water cylinder (7)    Material outlet (9)    Positive turbine wheel (12)    Coaxial reverse turbine wheel (13)    Double-head right turn worm packing auger (14)    Coaxial left turn worm packing auger (15)