Device for producing marsh gas by using rural multi-element organic wastes

The utility model relates to a device for producing marsh gas by using rural multi-element organic wastes. The device comprises a pre-treatment tank, a wastewater anaerobic fermentation tank, a straw bed reactor, a biogas slurry deep fermentation tank and a biogas slurry storage which are connected in series, wherein gas outlets are arranged the tops of the wastewater anaerobic fermentation tank, the straw bed reactor and the biogas slurry deep fermentation tank; the wastewater anaerobic fermentation tank and the biogas slurry deep fermentation tank adopt an AF process; the pre-treatment tank is internally provided with a collection net bag; straws are filled by using a straw box. The device for producing the marsh gas by using the rural multi-element organic wastes has the advantages that the device has the characteristics of wide fermentation raw material adaptability, saved one-time investment, simplicity and convenience for operation, low operation and maintenance cost, good gas production effect, stability and the like; the volume gas production rate is greatly improved when being compared with a traditional method; fermentation raw materials do not need to be extra pre-treated and can be directly fed, so as to meet the requirements of the treatment of the rural multi-element organic wastes and a current situation of labor shortage; the device has very good popularization and utilization values.