The laminar flow clean bench is an air purification device that provides a local dust-free and sterile working environment, and can artificially control and discharge the air that has been contaminated in the work area through a special filter channel to avoid harm to people and the environment. This kind of safe microbiological special clean bench is widely used in biological laboratories, medical and health, bio-pharmaceuticals and other related fields, and it has a good effect on improving the process conditions, protecting the operator's health, improving product quality and yield.