A cast-in-situ concrete hollow plate comprises reinforced concretes (1) and opening boxes (2), the opening boxes (2) are packed in the reinforced concrete (1) and are separated-arranged, the cast-in-situ reinforced concrete ribs (3) are arranged between one another, the cast-in-situ reinforced concrete upper plate (4) is arranged thereon and the cast-in-situ reinforced concrete lower plate (5) isarranged thereunder, the upper box plate (6) and the surrounding formwork (7) surrounds the opening box (2), and the invention is characterized in that the lower formwork of at least one side of the surrounding formwork (7) is the perforated formwork (8) which can be passed with slurry. In this way the lower formwork of at least one edge of the surrounding formwork is the perforated formwork which can be passed with slurry, in the application process part slurry can be filtered and the coarser aggregate will not enter and the quality of the cast-in-site plate is guaranteed, at the same time the opening box has the characters of simple structure, high strength, deformation resistance, excellent vibration resisting property, high production efficiency, low cost and the like, and the hollow plate is suitable for various building roofs, building covers, walls, base plates and hollow bridges.