Adjustable pressure type waste gas filtering and disinfecting device

The utility model provides an adjustable pressure type waste gas filtering and disinfecting device which comprises a first-stage buffer tank, a second-stage disinfecting tank and a third-stage pressure regulating tank which are sequentially in ventilation connection, the first-stage buffer tank is filled with activated carbon, the second-stage disinfection tank is filled with disinfectant, and thethird-stage pressure regulating tank is filled with liquid; a pressure adjusting pipe is arranged on the third-stage pressure adjusting tank, one end of the pressure adjusting pipe extends out of thethird-stage pressure adjusting tank and is communicated with the atmosphere, and the other end of the pressure adjusting pipe extends below the liquid level of liquid in the third-stage pressure adjusting tank; the third-stage pressure regulating tank is communicated with a negative pressure device; and the negative pressure device is used for sucking gas entering the third-stage pressure regulating tank through negative