The utility model relates to an integrative assembling steel mesh that is shaped like a flat or a curved surface, and is provided with a hollow cavity. In the technical proposal, two ends of a cylindrical steel pipe are provided with a welded bearing plate; the surface of the bearing plate and the wall of the cylindrical steel pipe are used as welding points; 8 chords with a T-shaped cross section are respectively welded at the two ends of the cylindrical steel pipe to form a double-layer cross-like splicing unit; on the construction site, a double-splicing plate and a high-strength bolt are used for connecting chords of two or more than two cross-like splicing units; thus the mesh structure that is shaped like a flat or a curved surface can be assembled. The mesh structure has a light and solid structure; the welding process can be completed in a factory so as to improve the accuracy and quality of production; the mesh adopts hollow-cavity beams but no diagonal members; thus water pipes and conduits can conveniently pass through the mesh; and the mesh has a regular structure, so the mesh structure can be used as a ceiling of floor or a roof.