Sealing positioning structure for sleeve element

The utility model relates to a sealing positioning structure for a sleeve element, which comprises an inner-layer sleeve element and an outer-layer sleeve sleeved on the inner-layer sleeve element, wherein the part of the inner-layer sleeve element embedded in the outer-layer sleeve is provided with a sealing section and a positioning section; the size of the positioning section is matched with the size of the outer-layer sleeve; the length of the sealing section is more than the length of the positioning section; a diameter of the sealing section is less than that of the positioning section; and a sealing element is arranged on the sealing section. The positioning section and the sealing section with relative smaller diameter are arranged in a separated form on a sleeved part and the positioning section is relatively short, thus, compared with the traditional sleeve element wholly adopting a small clearance fit form, the sealing positioning structure has the advantages that the sealing and the positioning ar