The utility model discloses a flue gas condensation dewatering device which comprises a condensation cavity, a condensation base and a compressor, the condensation cavity and the condensation base areconnected in a sealed mode through a sealing disc, a condensation core and a condensation pipe are arranged in the condensation cavity, the condensation core is in transition fit with the condensation cavity, and the refrigeration end of the compressor is connected with the outer side wall of the condensation cavity. A water-gas isolation cavity is formed in the condensation base, a stepped wateroutlet and a water-gas partition plate are designed in the water-gas isolation cavity, and water isolation between the flue gas inlet and the flue gas outlet is achieved through the water-gas partition plate. The utility model provides a flue gas condensation water removal device. An excellent water removal effect under a high-humidity working condition is achieved by combining the ingenious structural design of the condensation base, the condensation cavity and the like; and the inverter compressor is adopted to work, so that the stability of an output dew point of the flue gas preprocessoris improved, the problem of poor environmental adaptability of a conventional flue gas condensation water removal device is effectively solved, and the device has the advantages of high refrigerationpower, high water removal efficiency, low adsorbability and the like.