The utility model discloses a full -automatic steam sterilizer with simulation inner chamber, including full -automatic steam sterilizer body, the equal fixedly connected with slider in one side at the full -automatic positive one side in steam sterilizer body bottom and the back, slider includes first dead lever. This full -automatic steam sterilizer with simulation inner chamber, pass through fixing device, the telescoping device, the kelly, the draw -in groove, the haulage rope, first dead lever, the circle roller and the first in command's cooperation, when not needing full -automatic steam sterilizer body to slide, make the one end at the screw thread post back and the openly separation of first dead lever, because the stretch effect of spring, make the kelly peg graft in the draw -in groove, thereby prevent that the pulley is rotatory, even place full -automatic steam sterilizer body when unevenness subaerial, full -automatic steam sterilizer body can not slide yet, thereby it is more convenient to make the use of full -automatic steam sterilizer body, to prevent accidental's emergence.