Soldering tool connecting device and mounting method thereof

The invention relates to a soldering tool connecting device and a mounting method thereof. The connecting device comprises a connecting sleeve and an gas-guiding pipe, wherein a soldering tail and a soldering rod are respectively connected with two ends of the connecting sleeve; an air inlet hole and a soldering rod inner hole are respectively communicated with two ends of a soldering tail inner hole formed at the middle of the soldering tail; the gas-guiding pipe comprises an air inlet pipe and an air outlet pipe; one gas-guiding pipe through hole is formed in the air inlet pipe and the air outlet pipe in a sharing manner; the air inlet pipe is in seal fit with the soldering tail inner hole; the air inlet pipe is respectively in insertion fit with the through hole at the middle of the connecting hole and the soldering rod inner hole; a Y-shaped sealing ring is arranged at the air inlet of the soldering rod inner hole and is in seal fit with the outer wall of the air outlet pipe; and the soldering tail inner