The utility model discloses a
biosafety cabinet capable of double-layer
filtration, which comprises a cabinet body, an operation chamber is arranged in the cabinet body, and a bottom air duct is arranged at the bottom end of the operation chamber. By arranging the reducing
pipe, the
exhaust pipe, the exhaust outlet, the filter box, the exhaust filter, the air disc and the
high alcohol, double-layer
filtration of exhausted air is achieved, air can be exhausted into the reducing
pipe through operation of the exhaust fan,
airflow can be concentrated and pressurized through arrangement of the reducing
pipe, meanwhile, the air is conveyed into the filter box, and the filtering effect is improved. The air disc divides air into a plurality of small bubbles and increases the contact area with the high-
alcohol, the high-
alcohol can kill
bacteria in the air and adsorb particle dust and various
suspended solids, then the air is conveyed into the air exhaust opening, secondary filtering is conducted when the air passes through the air exhaust filter, and the exhausted air is purified; therefore, the exhausted air does not carry germs, the environment is prevented from being polluted, and the use safety is improved.