Coking crude benzene hydrogenation separation system and process coupled with styrene production device

The invention relates to a coking crude benzene hydrogenation separation system and process coupled with a styrene production device. According to the invention, the characteristics that the catalyst only plays a role in aromatic benzene and non-aromatic hydrocarbon hardly participates in the reaction in the alkylation section for producing styrene through catalytic dehydrogenation of ethylbenzene are utilized, the crude benzene hydrofining device is coupled with the styrene production device, and an extractive distillation system which is tedious in operation in the crude benzene hydrofining process is canceled; the purpose of separating non-aromatic hydrocarbon in a styrene production device is achieved, so that the energy consumption of a coking crude benzene separation system is reduced, and meanwhile, the construction investment cost of the device is reduced.