The clean bench is an air purification equipment that provides a local dust-free and sterile working environment. The indoor air is initially filtered by a pre-filter, pressed into a static pressure box by a centrifugal fan, and then filtered by a high-efficiency filter. Through the process, the clean air blown out forms a sterile and highly clean working environment. The clean bench is applicable to medical and health, biopharmaceutical, food, medical science experiment, optics, electronics, sterile room experiment, sterile microorganism test, plant tissue culture inoculation and other departments.