Flue gas humidity monitoring device for thermal power generating unit

The utility model relates to the technical field of thermal power generating unit flue gas humidity monitoring, in particular to a thermal power generating unit flue gas humidity monitoring device which comprises a flue gas humidity monitoring instrument body, a flange plate is arranged on the flue gas humidity monitoring instrument body, and a probe rod is arranged in the center of the bottom face of the flue gas humidity monitoring instrument body. A groove is formed in the bottom end of the probe rod, a spiral guide piece is arranged in an inner cavity of the groove, a bottom plate is arranged on the bottom face of the spiral guide piece, a mounting frame for fixing a smoke humidity monitoring sensor is arranged in the center of the spiral guide piece, and an assembling circular plate is arranged on the bottom face of the mounting frame. A buckle assembly is arranged on the bottom surface of the bottom plate of the assembling circular plate, flue gas inlet holes are formed in the lower end of the interior