Switching type CO2 desublimation separation system

The invention discloses a switching type CO2 desublimation separation system. The switching type CO2 desublimation separation system comprises a flue gas flow path and a cooling module, the flue gas flow path comprises a desublimation flow path and a sublimation flow path; the desublimation flow path comprises a dehumidification device, a gas supercharger, a first switching valve, a sublimation heat exchanger a inlet, a sublimation heat exchanger a outlet, a second switching valve, a first precooling heat exchange channel of a precooling heat exchanger, a third switching valve, a desublimation heat exchanger, a fourth switching valve and a second precooling heat exchange channel of the precooling heat exchanger which are communicated in sequence; and the sublimation flow path comprises a sublimation heat exchanger d outlet, a fifth switching valve, a compressor, a water cooling device and a liquid CO2 storage tank which are communicated in sequence. According to the invention, CO2 desublimation characteristic