Online monitoring device for concentration of particulate matters in flue gas

The utility model discloses an on-line monitoring device for the concentration of particulate matters in flue gas, which comprises a pipeline, the side wall of the pipeline is provided with a pick-and-place port, the inner wall of the pipeline is fixedly connected with a support ring which is flush with the inner bottom surface of the pick-and-place port, the outer side part of one side, far away from the pick-and-place port, of the support ring is communicated up and down, and the outer side part of the other side of the support ring is communicated with the pick-and-place port. A membrane fixing ring is arranged on the upper side face of the supporting ring, a filter membrane is arranged on the upper portion of the membrane fixing ring, and a second connecting rod is fixedly connected to the portion, located at the taking and placing opening, of the lower portion of the membrane fixing ring; and a baffle plate is arranged at the pick-and-place opening. Through the arrangement of the supporting ring, adhesio