The utility model discloses a need not whole prefabricated formula heat preservation wall of cast in situs, place in, including prefabricated wall body heated board and the connecting piece of settingon the wall body in the wall body, its characterized in that, the connecting piece includes buried bolt, anti -shearing steel plate, connecting sleeve and reservation box in advance, buried bolt's tail end is buryyed in advance in the wall body, buried bolt's top is the thread end in advance, and the thread end stretches out the wall body, anti -shearing steel plate, connecting sleeve and reservethe box and all be used for connecting two adjacent stifled heat preservation walls, anti -shearing steel plate installs the corner department of wall body, all install a side and the bottom of wallbody reserve the box, another side of wall body is installed the connecting sleeve, the corner department and the bottom of wall body all are equipped with the mounting groove, it has the perpendicular to to open in the mounting groove the wall body through -hole of wall body. The utility model discloses a full prefabricated construction, simple to operate, construction cycle is short.