A steel concrete hollow slab consists of steel concrete and cavity component being formed with empty mould shell and being contained in steel concrete. It is featured as forming cavity component by interval supporting pulling element and boss module, arranging two empty mould shells alternatively to form internal rib mould cavity and connecting them by interval supporting pulling element, projecting at least one boss out on bottom plate, forming cast C in C place steel concrete internal rib in its internal rib mould cavity and connecting it to cast C in C place steel concrete rib, forming cast C in C place steel concrete internal rib to be inversed T form rib. |