[Ion-transport system].

The utility model provides an ion transmission system. The ion transmission system comprises a sampling cone and an extraction lens, the end part with the smallest inner diameter of the first-stage extraction lens extends into the sampling cone, the inner diameter of the first-stage extraction lens is gradually increased along the transmission direction of ions in the first-stage extraction lens,and the outer diameter and the inner diameter of the first-stage extraction lens are gradually increased. The device has the advantages of high ion transmission efficiency, high detection sensitivityand the like.