The invention discloses a hangar tunnel roof structure resistant to debris flow and impact of falling stones and a construction method. The method is characterized by laying a water-proof layer (5) on a reinforced concrete top plate (1), pouring a reinforced concrete side wall (3) on one side of the reinforced concrete top plate (1), laying a clay stratum (6) and a polystyrene foam plate layer (7) between the water-proof layer (5)at intervals; laying a loaded filter (8) on the clay stratum (6) on the top, wherein an anti-corrosive steel wire rope (9) is in the netted structure and adhered to steel wire meshes (10); and fixing the anti-corrosive steel wire rope (9) is fixed with the steel wire meshes (10) through snap joints (11). The hangar tunnel roof structure resistant to debris flow and impact of falling stones and the construction method have following beneficial effects: defects in the prior art such as large amount of rebar, and great load of the top plate are solved; by adopting the steel wire net with the netted structure of the steel wire meshes, falling stones are intercepted and a buffer layer is fastened.