Online monitoring device for flue gas emission monitoring

The invention discloses an online monitoring device for flue gas emission monitoring, which comprises a main body ring, the main body ring is fixed on the inner side wall of a chimney, a monitoring probe is fixed on the inner side wall of the main body ring, and a probe cleaning mechanism is arranged in the main body ring; the probe cleaning mechanism comprises a plurality of through holes formed in the main body ring, the inner side wall of one through hole is rotationally connected with a rotating shaft through a bearing in a penetrating mode, the section, located in the through hole, of the rotating shaft is in interference fit with a vortex impeller, and two control cavities are formed in the main body ring; a plurality of insulating rods are fixed to the side wall of the section, located in the control cavity, of the rotating shaft. The device has the advantages that in the monitoring process, the monitoring probe can be continuously and automatically cleaned, the accuracy of the monitoring result is gua