Bioreactor for high-density fermentation

The utility model discloses a bioreactor for high-density fermentation, and relates to the technical field of biological reaction, an outer tank wall of a reactor tank body is sleeved outside an inner tank wall, an air inlet device, a feeding device and a pressure sensor are arranged above the outer tank wall, a stirring device is arranged inside the inner tank wall, and the stirring device is connected with the inner tank wall. The stirring device is arranged in the outer tank wall, the gas inlet device is communicated with a spiral stirring shaft in the stirring device, a plurality of light collectors are uniformly arranged along the circumferential direction of the outer tank wall, solar cell panels are arranged in the light collectors, and an exhaust device and a discharging device are arranged below the reactor tank body. The spiral stirring shaft is driven to rotate, a power device is not needed, the contact area of carbon dioxide gas and algae liquid is increased, the utilization rate of the carbon dio