Biological safety cabinet

The embodiment of the utility model provides a biological safety cabinet, and relates to the field of biomedical treatment. The problem that a large moving distance is needed for balancing the gravity of a glass door through a balancing weight can be solved. The biosafety cabinet comprises a cabinet body, a glass door, a balancing weight and a suspension mechanism, wherein the cabinet body is provided with an opening, and the glass door is slidably arranged on the opening in the vertical direction; the glass door is provided with a rack extending in the vertical direction. The balancing weight is slidably arranged on the cabinet body in the vertical direction. The suspension mechanism is fixed on the cabinet body and comprises a gear set, a screw rod and a sliding sleeve, the rack, the gear set and the screw rod are sequentially meshed and connected, and the sliding sleeve is in threaded connection with the screw rod; the sliding sleeve is connected with the balancing weight and used for driving the balancing