The invention relates to a light perpetual matrix for concrete filling, characterized in that the surface of the matrix (1) is provided with a overcast angle(2) at at least one corner, the overcast angle (2) is straight through upper and lower surfaces of the matrix (1), at least one groove (4) is arranged on the matrix (1), the overcast angles are communicated with each other through the groove (4), the overcast angle is provided with a protruding module (3), and an reinforcement (9) is arranged in the protruding module (3). The invention is suitable for various cast-in-situ concrete roofs, walls and structure of road and bridge project, especially for hollow non-girder roofs.