Waterproof node for fireproof wall of metal roof

The utility model discloses a waterproof node for a fireproof wall of a metal roof, which comprises a structural purline and an autoclaved aerated concrete block fireproof wall perpendicular to the structural purline, and a roof outer plate is arranged above the structural purline. Zinc-plated Z-shaped folding pieces are arranged in gaps between the roof outer plates and the autoclaved aerated concrete block firewalls. The lower portion of the flashing edge closing piece is connected with the galvanized Z-shaped folding piece, the lower end of the flashing edge closing piece is bent and then abuts against the roof outer plate, a groove is formed in the autoclaved aerated concrete block firewall, the upper portion of the flashing edge closing piece is bent upwards and then tightly attached to the structural purline, and the upper end of the flashing edge closing piece is inserted into the groove. The groove is formed in the wall body of the building block firewall, a gap between the wall body and the roof pane