Microminiature optical fiber sealing section leak detection tool

The utility model discloses an ultra-small optical fiber sealing section leak hunting tool, which comprises a tank body, a tank cover, a sealing cover and a connecting piece, the tank cover is connected with the tank body and provided with a first through hole. The sealing cover is arranged on the upper surface of the tank cover, a second through hole is formed in the sealing cover, the second through hole and the first through hole are coaxially formed, the sealing cover is made of rubber, and an optical fiber sealing joint is inserted into the second through hole; one end of the connecting piece is in threaded connection with the lower end of the tank body, and the connecting piece is externally connected with a helium mass spectrometer leak detector, so that the problem that a sealing ring matched with a subminiature sealing joint is difficult to use is solved, and meanwhile, the problems that deformation or optical fiber breakage is extremely easy to cause in an extrusion process and installation is diffi