Dry hanging type curtain wall back bolt type connecting piece used for green building decoration

The invention belongs to the field of back bolt type connecting pieces, and particularly relates to a dry hanging type curtain wall back bolt type connecting piece used for green building decoration.The dry hanging type curtain wall back bolt type connecting piece comprises a fixing mechanism, a movable mechanism, a positioning bolt and an expansion bolt. The fixing mechanism is arranged on a fixing frame on a wall through threaded fit of the positioning bolt and a threaded fixing hole. The movable mechanism is arranged on the back face of a decoration plate through expansion fit of the expansion bolt and an expansion hole. The decoration plate is arranged on the wall through cooperation of the movable mechanism and the fixing mechanism arranged on the decoration plate. In the whole decoration plate replacing process, decoration plates around a damaged decoration plate do not need to be detached, only the damaged decoration plate needs to be detached, then, replacement of a new decoration plate is conducted f