Anaerobic fermentation system

The utility model provides an anaerobic fermentation system, which relates to the field of caproic acid bacterial liquid culture, and comprises an anaerobic fermentation tank, a box body arranged on the side surface of the anaerobic fermentation tank, a cover plate arranged at one end of the box body and covering the anaerobic fermentation tank, a pressing plate arranged on the inner side of the box body, push rods arranged on the inner sides of the cover plate and the pressing plate, and a filter bag arranged on the inner side of the box body, a water injector is arranged on the inner side of the anaerobic fermentation tank and located above the filter bag, vinasse is placed through the filter bag, meanwhile, water is injected into the inner side of the filter bag through the water injector, and a push rod rotates on the inner side of a cover plate to enable a pressing plate to extrude the filter bag, so that the vinasse is filtered; according to the caproic acid bacterium liquid fermentation device, the fil