The invention discloses a construction method of a Z-shaped large-span aluminum alloy frame roof, and belongs to the field of buildings. The whole roof is sequentially divided into a first area, a third area, a second area, a fifth area and a fourth area from west to east. A latticed shell of the third area is firstly bulk-packed, then the latticed shell of the first area is integrally lifted in place and is folded with the latticed shell of the third area, then a special-shaped beam of the fifth area is installed, and then the latticed shell of the second area is integrally lifted in place and folded with the latticed shell of the third area and the special-shaped beam of the fifth area, and finally, the latticed shell of the fourth area is integrally jacked and folded with the special-shaped beam of the fifth area, different construction methods are adopted for different areas, and therefore the installation precision is improved, and the construction period is shortened. In addition, in the first area, the third area, the second area and the fourth area, latticed shells are firstly constructed, then tree-shaped supports are constructed, cross operation of installation of the aluminum alloy structure and the tree-shaped columns can be effectively achieved, two independent installation procedures are divided, the construction period is shortened, the installation precision is improved, and the accumulative error of the installation precision is reduced.