The cabin has a high degree of airtightness, with a leakage rate not exceeding 1%. The double doors are inflated for sealing and electronically interlocked. The cabin is under negative pressure control. When the negative pressure difference is higher than the set value, it will automatically operate at full speed. The inner surface of the cabin is treated for antibacterial purposes: The inner surface of the cabin is specially treated to achieve antibacterial effects, ensuring that there is no place for microorganisms to hide on the inner surface of the cabin forever. A software system compliant with computerized validation: The system has audit trail and electronic signature functions, meeting the audit requirements of FDA, 21CFR Part 11. It can be equipped with ultraviolet germicidal lamps, and a biosafety device can be installed either inside or outside.