The present invention relates to a light mould component for in-situ casting concrete. It includes a polyhedral solid light material component, and is characterized by that at least one transverse corner position of the described polyhedral solid light material component is equipped with a transverse chamfer, and in the interior of said polyhedral solid light material component a net reinforce can be contained, so that the strength and rigidity of said light mould component are greatly raised. It can be used for in-situ casting reinforced concrete or prestressed reinforced concrete floor, roof, wall body, foundation bedplate and bridge, etc. |