Novel angular-refluxing mixed stirring and filtering fermentation tank

The utility model discloses a novel angular-refluxing mixed stirring and filtering fermentation tank, and belongs to the field of fermentation equipment. The novel angular-refluxing mixed stirring and filtering fermentation tank comprises a tank body, a stirring device, a driving device, a filtering device and a biogas slurry refluxing device; a paddle-type stirring blade generates radial acting force and has a strong shearing action, so that dispersion of big-particle size solid matters and sufficient mixing of the big-particle size solid matters and biogas slurry are promoted, and further crusting is avoided; while the biogas slurry at the bottom is pumped by a refluxing screw pump, liquid in the tank body is forced to flow in the circumferential direction so as to form liquid stirring, and the shearing action is small, so that damage to methane bacteria is avoided; under the coaction of mechanical stirring and crushing of materials and liquid refluxing formed by sprinkling of the pumped biogas slurry, the biogas slurry and the materials in the fermentation tank are sufficiently mixed, so that the stirring effect is improved and the stirring power consumption is lowered; the tank body has two discharge ports, and the biogas slurry and floating residues in the fermentation tank can be completely discharged, so that the fermenting efficiency is improved; the filtering device can save fermentation raw materials to further reduce the cost. The novel angular-refluxing mixed stirring and filtering fermentation tank is simple in structure and convenient to operate.