Fabricated building wall connecting piece and fabricated building wall

The invention discloses a fabricated building wall connecting piece and a fabricated building wall. The connecting piece comprises an external tail disc and a sleeve, wherein the diameter of the external tail disc is larger than that of the sleeve, and the external tail disc is used for fixing a heat preservation layer of the building wall; the sleeve comprises a connecting end and an anchoring end, and the connecting end extends into the external tail disc and is connected with the external tail disc; and the anchoring end comprises an anchoring structure and a heat insulation material which is filled in the anchoring end, and the anchoring structure is used for connecting a concrete layer of the building wall and separating the concrete layer from the heat insulation material. According to the fabricated wall connecting piece, the stress structures of a facing layer, the heat preservation layer and the concrete layer in the wall are improved, so that the facing layer and the heat preservation layer can be c