Biogas anaerobic fermentation device

The utility model belongs to the biogas fermentation field especially relates to a biogas anaerobic fermentation device, and this fermenting installation includes: the stratum basale, the first side wall and cover the top cap at the first side wall top of setting on the stratum basale, stratum basale, the first side wall and top cap enclose into first cavity, be provided with first gas vent on the top cap, the last inlet pipe that is provided with of biogas anaerobic fermentation device, the setting just is located the second lateral wall in the first side wall outside and covers at second lateral wall top closure film on the stratum basale, stratum basale, the first side wall, top cap, second lateral wall and seal membrane enclose into the second cavity, be provided with second gas vent and natural pond hydrorrhea head piece on the second lateral wall, with the overflow mechanism of setting in first cavity for carry the upper natural pond liquid of first cavity to the bottom of second cavity. Have higher fer