Disclosed is a reinforced-bar concrete slab, which comprises a reinforced-bar concrete and a three-dimensional formwork, wherein the three-dimensional formwork is enclosed in the reinforced-bar concrete, the three-dimensional formwork comprise an upper top board (1), peripheral side panels (2) and a lower bottom (3), the upper top board (1), the peripheral side panels (2) and the lower bottom (3) are linked each other to form a polyhedral closed cavity (4), characterized in that the periphery of the bottom edge (26) projected from said lower bottom (3) or the top board (1), or the lower bottom (3) and the top board (1) is in the form of saw teeth, waves, sloping sides, or steps, or the projections simultaneously include exposed anchoring ribs (24), exposed nets (25), exposed filaments (27), anticracking grid cloth (28), anticracking iron sheets with thorn-headed worms (29), dovetail-shaped iron sheets or meshed iron sheets or their combination. The invention can be applied to hollow concrete structures such as roofs, foundation floors, concrete walls and bridges, especially to project of hollow floor slabs. |