Ultrahigh vacuum ship pipeline sealing joint capable of improving sealing performance

The invention discloses an ultrahigh vacuum ship pipeline sealing joint capable of improving sealing performance, and relates to the technical field of ship pipeline joints. The device comprises pipe bodies, one ends of the two pipe bodies are welded through a hydraulic assembly, and the hydraulic assembly is used for reinforcing and connecting the peripheral side faces of the two pipe bodies through a reinforcing assembly; the hydraulic assembly comprises a connecting ring, the two ends of the connecting ring are welded to one ends of the two pipe bodies respectively, a hydraulic oil bin is fixedly connected to the center of the interior of the connecting ring through four oil supply pipes, and the four oil supply pipes penetrate through the inner wall of the connecting ring to the exterior of the connecting ring to be movably connected with the reinforcing assembly. The reinforcing assembly is arranged, when the hydraulic rod is continuously lifted upwards, the telescopic rod moves upwards at the same time,