Safety biological cabinet sterilization device

The utility model discloses a safety biological cabinet sterilization device which comprises a cabinet body, wherein an exhaust tube is arranged on the top of the cabinet body; an air supply filter is arranged on an air inlet of the exhaust tube; a fan is connected to the exhaust tube outside the air supply filter. The safety biological cabinet sterilization device is characterized in that a steam tube is arranged on one side of the air inlet in the lower part of the air supply filter; the lower end of the steam tube is connected with a sterilization steam chamber; the sterilization steam chamber is fixed on a side wall of the cabinet body; the sterilization steam chamber is internally provided with a disinfectant; a liquid inlet hole and an air outlet hole are formed in the top of the sterilization steam chamber; a liquid level sensor and a temperature sensor are arranged on a side wall of the sterilization steam chamber; a heater is arranged at the bottom of the sterilization steam chamber; the liquid level