Protective structure for air tightness detection

The utility model relates to a protective structure, and particularly discloses a protective structure for air tightness detection, which comprises two supporting seats, a mounting plate and a movable plate are arranged between the two supporting seats, the movable plate is arranged below the mounting plate, two ends of the mounting plate are fixedly connected with the supporting seats, two ends of the movable plate are slidably connected with the supporting seats, and a rectangular cover is arranged at the lower end of the movable plate. The upper end of the rectangular cover is fixedly connected with the movable plate, and a rectangular sleeve is arranged at the lower end of the rectangular cover, arranged on the outer side of the rectangular cover in a sleeving mode and slidably connected with the rectangular cover. The first adjusting piece and the second adjusting piece can push the rectangular cover and the rectangular sleeve to fall down in sequence to protect the test area of the test board, after the