A lightweight tire mold component for cast-in-place concrete, comprising a polyhedral solid lightweight material component (1), characterized in that the polyhedral solid lightweight material component (1) is an integral solid block, and the polyhedral solid lightweight material component (1) A reinforcing rib (2) is arranged on the surface or inside of the member (1). In this way, since the surface or inside of the lightweight tire mold member is provided with reinforcing ribs, the strength and rigidity of the lightweight tire mold member are greatly improved, and the phenomenon of damage to the lightweight tire mold member is not easy to occur; at the same time, the lightweight tire mold member also has Simple structure, excellent anti-deformation, anti-vibration performance, easy manufacture, low cost, convenient construction, fast construction speed, etc., suitable for floors, roofs, walls, foundation slabs and It is suitable for use on bridges, especially for girderless floors.