Plant flue gas emission structure with alarm function

The utility model discloses a factory building flue gas emission structure with an alarm function, which relates to the technical field of building ventilation structures and comprises a factory building, an opening is arranged at the top of the factory building, a gas collection chamber is arranged above the opening, an exhaust pipe is mounted on the outer wall of the gas collection chamber, and the exhaust pipe is communicated with the gas collection chamber. The air outlet end of the exhaust pipe is connected with the air inlet end of the purifier, the left end of the exhaust pipe is provided with a connecting flange, the exhaust pipe is fixedly sleeved with a mounting flange, and an inner cavity of the exhaust pipe is provided with an exhaust fan electrically connected with a first knife switch; the device further comprises a detection alarm unit used for detecting whether the exhaust fan works or not, and the detection alarm unit is electrically connected with the second knife switch. The detection alarm