Calibration switching structure of dust sampling head

The utility model provides a calibration switching structure of a dust sampling head, the calibration switching structure is connected between the sampling head and a gas flow calibrator, the calibration switching structure comprises a butt joint and a butt joint pipe which are detachably connected, the butt joint is connected with the sampling head, the butt joint is provided with a square block which is inserted into a sampling port of the sampling head, and the butt joint pipe is connected with the sampling head. A first magnet is arranged at the end of the square block, the butt joint pipe is connected with the gas flow calibrator, one end of the butt joint pipe is detachably connected to the end, away from the square block, of the flow channel, and a second magnet attracted with the first magnet is arranged at the other end of the butt joint pipe. The butt joint is matched with the sampling opening of the square sampling head, the butt joint pipe is matched with the round connector of the round gas flow