Continuous efficient rectifying and desalting integrated device

The utility model provides a continuous efficient rectifying and desalting integrated device which comprises a primary rectifying tower connected with a raw material tank, the primary rectifying tower is connected with a primary tower reboiler, a gas phase of the primary tower reboiler is connected with a secondary distillation tower, a liquid phase of the primary tower reboiler is connected with an evaporation separator, and a liquid phase of the evaporation separator is connected with a crystallization kettle. The evaporation separator and the gas phase of the crystallization kettle are connected with the second-stage distillation tower through a demister, the second-stage distillation tower is connected with a second-stage tower reboiler, the second-stage tower reboiler is connected with a third-stage rectifying tower through a second-stage tower reboiler transfer pump, the third-stage rectifying tower is connected with a third-stage tower reboiler, and the third-stage rectifying tower is connected with a