Biological fermentation tank capable of preventing infectious microbe pollution

The utility model discloses a biological fermentation tank capable of preventing infectious microbe pollution, and relates to the technical field of biological fermentation tanks. The surface of one side of the sterilization pipe is fixedly provided with a first gas conveying pipe, the other end of the first gas conveying pipe is fixedly provided with a purification box, the upper surface of the purification box is fixedly provided with a motor, the surface of the other side of the purification box is fixedly provided with a second gas conveying pipe, and the other end of the second gas conveying pipe is fixedly provided with a fermentation tank; a condenser pipe is fixedly mounted between the two second gas conveying pipes, the condenser pipe is matched with the second gas conveying pipes, gas in a sterilization pipe is fully irradiated through mutual cooperation of an ultraviolet lamp and a refraction plate, so that effective sterilization can be achieved, stirring blades stir the interior of the purificati