The invention relates to a process for mounting a splicing type low-carbon heat insulating energy-saving plate. The process is characterized by comprising the following specific steps of: processing a base layer; hanging a wire; anchoring a customized connecting hanging piece A; mounting a low-carbon heat insulating energy-saving plate of a bottom layer starting position; mounting a low-carbon heat insulating energy-saving plate; and cleaning the surface of the low-carbon heat insulating energy-saving plate, wherein a layer construction method from top to bottom is adopted during the installation. The invention has the advantages that the process for mounting the low-carbon heat insulating energy-saving plate is simple and quick; a special adjustable dry hanging connecting piece is matched; and a hollow splicing pipe is pre-embedded in a surface material decoration layer to ensure that the mounting process is firm and reliable and saves labor and time, thereby the construction period is shortened, and the mounting cost is greatly reduced.