The invention relates to a cast-in-situ concrete hollow floor slab, which comprises reinforced concrete (1) and cavity die casing components (2), the cavity die casing components (2) are included in the reinforced concrete (1), cast-in-situ reinforced concrete ribs (3) are adopted between the cavity die casing components (2), the cavity die casing components (2) comprise upper plates (4), peripheral side walls (5) and lower plates (6), the upper plates (4), the peripheral side walls (5) and the lower plates (6) are enclosed into the closed cavity die casing components (2), the invention is characterized in that the upper plates (4), the peripheral side walls (5) and the lower plates (6) of the cavity die casing components (2) are composed of components (7), each component (7) is composed of at least a prefabricated plate (8) and at least a cast-in-situ plate (9) of the bond prefabricated plate (8), the upper surfaces of the upper plates (4) are included in the cast-in-situ concrete hollow floor slab or the lower surfaces of the lower plates (6) are included in the cast-in-situ concrete hollow floor slab or the upper surfaces of the upper plates (4) and the lower surfaces of the lower plates (6) are included in the cast-in-situ concrete hollow floor slab, and fixed or positioned structures (11) are arranged at the connecting positions of the prefabricated plates (8) or the cast-in-situ plates (9). Thereby, the invention is suitable for cast-in-situ reinforced concrete or pre-stressed reinforced concrete hollow floor slabs.