Extraction method and water solution phase-change separation system of purified water

The invention relates to an extraction method and a water solution phase-change separation system of purified water. The invention aims at providing a water solution phase-change separation system for extracting purified water from a solution, and providing an extraction method of purified water for separating purified water from the solution. The water solution phase-change separation system comprises a fan system, a humidifier A, a heat exchange chamber, a heater, a humidifier D and a condenser pipe. The extraction method of the purified water comprises the following steps: (1) humidifying air; (2) heating the air in the step (1); (3) heating the air in the step (2); (4) humidifying the air in the step (3); (5) applying the air in the step (4) into a heating source in the step (2). By adopting the extraction method, the heat transfer mechanism inside the system is fundamentally changed, distillation evaporation of the water solution is changed into low-pressure evaporation, the internal heat and mass transfer processes are enhanced, and the water production rate of unit energy consumption is doubled.