Provided is a flue gas waste heat recovery device, comprising a flue gas unit (1), a humidifier unit (2), a steam-water heat exchanger unit (3) and a drier unit (4). The flue gas unit (1) comprises a combustor (11) and a combustion chamber (12), an inlet of the combustor (11) being connected with an air outlet of the humidifier unit (2), and an outlet of the combustor (11) being connected with an inlet of the combustion chamber (12). A flue gas outlet of the combustion chamber (12) is connected with a flue gas inlet of the steam-water heat exchanger unit (3), and a flue gas outlet of the steam-water heat exchanger unit (3) is connected with a flue gas inlet of the drier unit (4). A flue gas outlet of the drier unit (4) opens into a chimney in communication with the outside; a hot water outlet of the drier unit (4) is divided into two lines, with one line overflowing outwards via a pipeline and the other entering the humidifier unit (2); and a cooling water outlet of the humidifier unit (2) is connected with a cooling water inlet of the drier unit (4) via a drier spray pump (5). Hot water in the steam-water heat exchanger unit (3) overflows outwards via a pipeline; a return water inlet of the steam-water heat exchanger unit (3) is connected with a hot water return pipeline; and a water supply outlet of the steam-water heat exchanger unit (3) is connected with a hot water supply pipeline.
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