Industrial waste gas monitoring device convenient to fix

The utility model discloses an industrial waste gas monitoring device convenient to fix, which comprises a bottom plate, a placement box fixedly arranged on the top surface of the bottom plate, the bottom plate is arranged at the bottom of the placement box, the device can be stably arranged through the bottom plate, and a protective frame is arranged on the bottom plate on the two sides of the placement box. The arrangement box and the clamping structure are fully protected by adding the protection frame, the clamping structure can be closed through mutual magnetic attraction of a first magnetic attraction plate and a second magnetic attraction plate, an exhaust pipe is inserted into one end of a round pipe, sealing is conducted through a sealing piece at the moment, and meanwhile the round pipe and the exhaust pipe are fastened by rotating a locking ring; at the moment, waste gas in the exhaust pipe reaches the gas conveying pipe, the gas conveying pipe is communicated with the adapter pipe, the adapter pip