Prefabricated laminated slab of descending slab

The utility model relates to a prefabricated laminated slab of a descending slab, which comprises a large descending slab prefabricated laminated slab, the large descending slab prefabricated laminated slab comprises a first prefabricated laminated folded plate, the first prefabricated laminated folded plate is Z-shaped, the horizontal part of the first prefabricated laminated folded plate is also provided with two sections of first cast-in-place slabs, and the two sections of first cast-in-place slabs are respectively provided with a second cast-in-place slab and a third cast-in-place slab. The first cast-in-place slab is attached to the outer surface of the first prefabricated laminated folded plate, first cast-in-place lap joint steel bars are further fixedly arranged on the first cast-in-place slab, the first cast-in-place lap joint steel bars are two sections of horizontal straight-strip-shaped steel bars, the first cast-in-place lap joint steel bars are parallel to the first cast-in-place slab, and the