Clean workbench is a kind of box air purification equipment which can provide local clean, clean and sterile working environment with a level of 100 (ISO level 5). The polluted air in the working area can be artificially controlled through special filtering channels to avoid harm to people and the environment. It can keep the performance parameters such as wind speed, air cleanliness, noise, vibration and lighting in the working space to meet the requirements of laboratory use. It is widely used in biology laboratory, medical hygiene, biopharmaceuticals and other related industries. It can improve the technological conditions, protect the health of operators and improve product quality. Good results were obtained in both yield and yield.