Portable multi-size airtightness measuring jig

The utility model discloses a portable multi-size airtightness measuring jig, which belongs to the field of airtightness measuring jigs, and comprises a measuring jig assembly, the surface of a lower jig is provided with a convex part, the surface of the convex part is provided with a testing cavity, the inner wall of the testing cavity is provided with a built-in convex edge, and the surface of the built-in convex edge is provided with an embedding groove. A built-in convex edge is arranged in the test cavity, a sealing space ring is arranged at the upper end of the built-in convex edge and located in the caulking groove, the other end of the rubber air pipe is connected with a compressed air inflation pump, the lens can be pressurized, compressed air is cut off, and after the pressure is stable, whether the lens leaks or not is judged through air pressure changes; the built-in convex edge is provided with the embedded groove, the sealing space ring is connected in the embedded groove in a sealed mode, a lar