Industrial waste gas detection device

The utility model discloses an industrial waste gas detection device which comprises a waste gas pipe, a circulating pipe installed on the waste gas pipe, a filtering chamber and a detection chamber,the circulating pipe is a horizontal U-shaped pipe, two ports of the circulating pipe are communicated with the waste gas pipe in a sealed mode, and an inlet of the filtering chamber is communicated with one of the circulating pipes in a sealed mode through a connecting pipe. An outlet of the detection chamber is hermetically communicated with the other pipe of the circulating pipe through an exhaust pipe, an outlet of the filter chamber is hermetically communicated with an inlet of the detection chamber, and an exhaust fan is mounted on the exhaust pipe; a light source is installed outside one end of the detection chamber, and the other end of the detection chamber is internally connected with a spectrometer through an optical fiber. According to the utility model, the U-shaped circulating pipe is connected betwe