Door in door

The utility model discloses a door in door, including main door and little door, main door is including main door frame, main door leaf, skeleton, PLASTIC LAMINATED and fireproof lock, main door frame is fixed or welded fastening or other fixed mode fixed mounting in door openings with expansion bolts the inside a plurality of skeletons group that sets up of main door leaf, skeleton group will the internal cavity of main door leaf falls into four each internal cavity of main door leaf is filled in and is equipped with PLASTIC LAMINATED and the fireproof core board who evenly is full of the internal cavity the following optional position of main door leaf: the through -hole is opened to upper portion, middle part, lower part, and skeleton and reinforcing plate are inlayed all around to the hole, form the little door frame of little door, the little door frame outside sets up the hinge, is provided with the little door leaf through little hinge or hinge connection in little door frame inboard. The utility model