With the development of computer simulation technology, virtual experiment, as an effective supplement to traditional practice and experimental teaching, is one of the important means to strengthen practice teaching and improve teaching quality. Because the raw materials and processes of chemical and pharmaceutical enterprises, especially the dangerous typical chemical processes under key supervision, have high risks such as flammability and explosion, college students have no basic training opportunities for the operation of such processes. The virtual experiment teaching system, virtual simulation technology and man-machine interaction are adopted to conduct simulation experiments, which provide students with safer, more free and more flexible experimental scenes. The systems of operation interaction, task guidance and timely evaluation make up for many limitations of chemical engineering practice teaching. Students have a strong sense of experience. Digital and networked applications can help teachers organize online and face-to-face teaching, improve teaching evaluation and form a diversified teaching network. Under the background of new engineering and technical disciplines, the construction of virtual laboratory is a safe, economical and efficient chemical practice scheme, which can better meet the demand of the society for chemical talents in the information age.