Clean room airtight access hole with companion ladder

The utility model relates to a clean room airtight access hole with a companion ladder. An access door (1) is installed on a fixing frame (2), airtight bars (6) are fixed to mounting joint seams of the fixing frame (2) and the access door (1), and a folding stairway (4) is installed on the fixing frame (2). Because the concealed folding climbing ladder is arranged in the access door for enhancing the sealing structure, the airtight performance of a clean room can be effectively improved, the maintenance work efficiency in a clean area can be effectively improved, and it can be guaranteed that the environment inside the clean area is not polluted by the external environment. For a clean room on a high floor, because the folding climbing ladder is arranged, risk brought by the situation that a maintainer carries a ladder to pass through the clean room can be reduced; the access hole can further be opened and closed through an automatic control system according to needs, the identify of the maintainer can be ide