NOVELTY - The marsh gas production system comprises a feeding tank, a main anaerobic tank, and a discharge tank. The main anaerobic tank is respectively connected with the feeding tank and the discharging tank, and is provided with an air outlet pipe. The discharging tank is internally provided with a slagging pipe and a biogas slurry discharging pipe which are connected with an inlet end of a discharging motor. The system is provided with an organic biogas slurry pipe. A feeding circulating pipe is communicated with the feeding tank.    USE - Used as a marsh gas production system.    ADVANTAGE - The system increases utilization rate of the marsh gas.    DETAILED DESCRIPTION - The marsh gas production system comprises a feeding tank, a main anaerobic tank, and a discharge tank. The main anaerobic tank is respectively connected with the feeding tank and the discharging tank, and is provided with an air outlet pipe. The discharging tank is internally provided with a slagging pipe and a biogas slurry discharging pipe which are connected with an inlet end of a discharging motor. The system is provided with an organic biogas slurry pipe. A feeding circulating pipe is communicated with the feeding tank. A slagging filter tank pipe is communicated with a liquid and slag separating tank. An outlet of the discharging motor is respectively communicated with the organic biogas slurry pipe. The feeding circulating pipe is communicated with the feeding tank and the slagging filter tank pipe. The main anaerobic tank is present in hemispherical shape. The feeding tank is provided with an overflow pipe and a field discharged waste feeding hole. The inlet end of the discharging motor and the biogas slurry discharging pipe are provided with a magnet. The discharging tank is further provided with a discharging pool cover. The discharge tank cover is provided with a liquid level measuring hole. The liquid level measuring hole is provided with a liquid level meter. The liquid level meter is provided with a floating head. The anaerobic main tank is provided with a main valve box and a temperature detecting device. The liquid slag separating tank is provided with the discharge tank and the organic biogas slurry pipe. An INDEPENDENT CLAIM is included for a method for producing marsh gas.