The utility model belongs to the technical field of connect and provide the utility model relates to a cable seals lock on connection with insulating properties, including lock on connection and the crossover sub through the tight halving head of threaded connection, the seal groove of placing O type sealing washer is all opened to tight halving head both sides, the inside cable lock sleeve that is equipped with of tight halving head, the inside rubber sleeve that establishes of cable lock sleeve. The lock on connection is the tight halving head of copper nickel plating material, just the inside of tight halving head is the notch cuttype structure of mutually supporting with the appearance realization of cable lock sleeve. The crossover sub is the crossover sub of epoxy material DFL202 material, just there is a reducing inclined plane inside of crossover sub, and this inclined plane will be greater than the locking claw of cable lock sleeve and the contained angle of horizontal axis with the angle of horizontal axis. The utility model discloses good, the insulating nature of leakproofness is strong, satisfies the requirement that long -term outdoor use need not the change.