Styrene is an important basic organic chemical materials that can be used to produce synthetic rubber, synthetic resin and protective coatings, etc.. Use ethylene and benzene as raw materials, and aluminum trichloride catalyst, to conduct that liquid phase alkylation reaction at a high temperature, produce intermediate goods ethylbenzene, and ethylbenzene is catalyzed for dehydrogenation in a vacuum condition, to produce crude production of styrene, then rectifed to produce fine styrene.