The utility model discloses a joint is held tightly to power transmission line anticreep, including cylindrical casing, cylindrical casing both ends all are equipped with the opening, cylindrical casing includes the last casing of connecting through the connecting axle and lower casing, the epitheca side vertical direction of wall is equipped with the draw -in groove, the vertical orientation of casing is equipped with and matees the buckle arch of using with the draw -in groove down, the shells inner wall opening part is equipped with the hasp sheetmetal down, it is equipped with the magnetic card edge of matcing the use with the hasp sheetmetal to go up the shells inner wall opening part, install on the cylindrical shells inner wall and aerify the chamber, it is equipped with N type runner to aerify intracavity portion, comprising a cylindrical shell, the tip of inflating the chamber is equipped with to lie in and leads to extra -oral inflation inlet. The draw -in groove, buckle of the installation through the installation are protruding, hasp sheetmetal and magnetic card along the fine joint of having fixed, through the holding tightly the power transmission line of having aerifyd completion that chamber, rupture membrane and fibre layers can be fine of installation.