Energy-saving styrene production device

The invention is mainly applied to the technical field of styrene production, and particularly relates to an energy-saving styrene production device. The energy-saving styrene production device comprises a coarse styrene high pressure tower, wherein material inlets in the upper parts of the coarse styrene high pressure tower and a coarse styrene low pressure tower are respectively connected with a material outlet of an ethylbenzene dehydrogenation system; material outlets in the bottoms of the coarse styrene high pressure tower and the coarse styrene low pressure tower are respectively communicated with a styrene tower; the bottom of the coarse styrene low pressure tower is communicated with a low pressure tower reboiler; the top of the coarse styrene high pressure tower is communicated with a material inlet of an ethylbenzene tower through a tower top gas output pipe; the tower top gas output pipe is communicated with the low pressure tower reboiler; the top of the coarse styrene low pressure tower is commun