The utility model discloses a large -scale spiral case in high altitude overhauls platform belongs to spiral case equipment inspection technical field. Its technical scheme does: a large -scale spiral case in high altitude overhauls platform, includes that circumference is equipped with the maintenance platform of rail, examine and repair the holder hinged on a platform terminal surface and the wall, wherein, set up lifting adjusting device on another terminal surface of maintenance platform. The beneficial effects of the utility model are that: but this overhauls platform one -man operation, and the levelness of overhauing the platform is adjusted to lifting adjusting device's the convenience that sets up, can also realize folding, has saved manpower, time in a large number, has improved work efficiency and work safety nature.