NOVELTY - Methane production system comprises a feeding pipe, a discharging pipe and a U-type fermentation pipeline. The feeding tube and discharging pipe are vertically connected to the ends of the U-type fermentation pipeline. The U-type fermentation pipeline is placed between upper portions of a hydraulic pressure part. The hydraulic pressure part is connected between feeding tube set with drainage pores. The U-type fermentation pipeline and feeding tube are fixed to a gas feeding pipe blocking plate. The U-type fermentation pipeline and discharging pipe are fixed to gas feeding pipe blocking plate.    USE - Used as methane production system.    ADVANTAGE - The system has uniform distribution of strain, and high gas production rate; effectively prevents encrustation phenomenon; and is suitable for large-scale production.    DETAILED DESCRIPTION - Methane production system comprises a feeding pipe, a discharging pipe and a U-type fermentation pipeline which is placed horizontally in the system. The feeding tube and discharging pipe are vertically connected to the ends of the U-type fermentation pipeline. The U-type fermentation pipeline is placed between the upper portions of a hydraulic pressure part. The hydraulic pressure part is connected between feeding tube which is set with drainage pores. The U-type fermentation pipeline and the feeding tube are connected to a gas feeding pipe blocking plate. The U-type fermentation pipeline and the discharging pipe are connected to the gas feeding pipe blocking plate. An air stopping plate is located between gas feeding pipe blocking plates. An inlet/outlet pipe is located between the feeding tube and the adjacent air resistant plate or adjacent air resistance plate located between fermentation regions. The top part of each fermentation region is provided with a separation manifold. The separation manifold is provided with a valve unit.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the methane production system.