The invention relates to a multi-dimension building external member in the field of fully fabricated buildings, the multi-dimensional building external member comprises a building plate and a connecting part, the building plate is made up of first panel in the length direction and a second panel in the thickness direction in an encircled mode, the inner portion of the building plate is divided into a plurality of inner cavities by a transverse rib of the building plate and a longitudinal rib of the building plate, the first panel folds inward to form a folded plate after extending outward in the width direction, and the outer side surface of the second panel is provided with convex teeth ; the connecting part is composed of a connecting body and an outer convex part, the outer convex partis positioned on the outer side surface of the connecting body, and a groove is formed between the outer convex part and the connecting body, and the shape of the groove is matched with the shape of the folded plate; and the shape of the outer convex part is matched with a space formed by the folding inward of the folded plate and the second panel, and the outer convex part is opposite to the convex teeth. According to the multi-dimension building external member in the field of fully fabricated buildings, the assembly of the external member is convenient, the assembly forms are various, and an unified structural element is used to build various architectural structures, so that multi-dimension building of the a building element is achieved.