The multi-span film greenhouse is mostly circular arch, and the roof and surrounding area are covered with imported PE or PO composite function and long-life drip-free film. This kind of greenhouse has large span, spacious and bright interior, good ventilation effect, and provides more space for indoor facilities and personnel flow. The main structure adopts assembled hot-dip galvanized skeleton, which ensures the overall anti-corrosion ability of the greenhouse skeleton. Hot-dip galvanized steel skeleton is used for main arch, purlin and column. Hot-dip galvanized pipe is used between main arch and main arch. M-type suspender is used for main arch to enhance the load-bearing capacity of roof. Bolted assemblies are used to connect all the rods, and large flow drainage grooves are installed at the top of the connecting columns.