Zero-leakage composite waterproof system for building construction

The zero-leakage composite waterproof system for building construction comprises a concrete surface layer, a slope making layer is arranged at the top end of the surface layer, a heat preservation layer is arranged at the top end of the slope making layer, a cement mortar leveling layer is arranged at the top end of the heat preservation layer, and separation seams are formed in the leveling layer at equal intervals. The leveling layer is divided into a plurality of areas by the separation seams, a leveling mesh is placed at the top end of the interior of the leveling layer in each area, a waterproof layer is arranged at the top end of the leveling layer, a protective layer is arranged at the top end of the waterproof layer, and an anti-crack mechanism is placed in the protective layer. According to the roof leveling layer, the adhesiveness between cement mortar in the leveling layer can be improved, so that the leveling layer is prevented from cracking, and the situation that the leveling layer is influenced