The invention discloses a precast spliced concrete slab wall body, which comprises an inner wall panel, an outer wall panel and an intermediate concrete layer. The inner wall panel and the outer wall panel are formed by splicing precast concrete slabs, the middle part of the concrete layer is provided with a steel reinforced frame, the steel reinforced frame is arranged along the whole length direction of the wall body and is connected with a bearing component on the wall edge, and horizontal steel wires are arranged at certain intervals along the height direction of the steel reinforced frame; and the inner surfaces of the inner wall panel and the outer wall panel are respectively provided with a prismatic table type bulge, and positioning steel wires parallel to the plate direction penetrate out of the prismatic table, are arranged in a triangular shape and are in clamping connection with the horizontal steel wires in the steel reinforced frame of the wall body. The invention has the advantages of good wall integrity, convenient construction, no need for formwork removal, low average density and good thermal insulation performance. Moreover, for the wall body constructed in the method, the manufacturing cost per unit area can be reduced.