Flue gas sampling probe capable of preventing harmful gas leakage during maintenance

The utility model discloses a flue gas sampling probe capable of preventing leakage of harmful gas during maintenance, which comprises a shell, a gas inlet pipe, a gas outlet pipe, a gas inlet pipe and a gas outlet pipe, the gas sampling probe rod is fixed at one end of the shell through a mounting seat, and the gas sampling probe rod is communicated with the sampling cavity; the mounting end cover is fixed at the other end of the shell, an insertion hole communicated with the sampling cavity is formed in the mounting end cover, and an elastic sealing cover plate used for covering the insertion hole is hinged to the inner side wall of the mounting end cover; the probe filter element seat is detachably mounted on the outer side surface of the mounting end cover, a probe filter element is fixed on the probe filter element seat, the probe filter element extends into the sampling cavity through the insertion hole, and a sampling gas outlet hole communicated with the interior of the probe filter element is formed