Polymerization process and device of carbon dioxide-based polycarbonate copolymer

The invention discloses a polymerization process and device of a carbon dioxide-based polycarbonate copolymer. The polymerization process and device of the carbon dioxide-based polycarbonate copolymer can be operated intermittently or continuously, and a liquid material in the reaction kettle returns to the reaction kettle after passing through the external heat exchanger and is distributed in a carbon dioxide gas phase in the upper space in the reaction kettle through the distributor; and then the liquid phase enters the external heat exchanger again through the lower part in the reaction kettle to circulate, so that an enough reaction phase interface is provided, the chain link quantity of the carbonic ester is not reduced after amplification, and the risk of temperature runaway is avoided. Besides, in the whole reaction process, the carbon dioxide does not transfer mass with the outside, so that the carbon dioxide does not need to be recovered, the energy consumption is reduced, and meanwhile, the safety r