The utility model provides a preset component for putting up emergent hangar tunnel of falling rocks is prevented in mountain area which the structure is: it comprises a plurality of U -shaped support frames, many wire nets, many first tie -beams, many second tie -beams and duo gen top tie -beam to preset the member, a plurality of U -shaped support frames set up along road extending direction, connect through first tie -beam, second tie -beam and top tie -beam between two adjacent U -shaped support frames and form a supporter, a single supporter surface has all covered a wire net, the utility model discloses an useful technological effect is: the utility model provides a preset component for putting up emergent hangar tunnel of falling rocks is prevented in mountain area, but should preset component alongside uninterrupted loading usefulness at present, when falling rocks hidden danger is eliminated, can conveniently demolish.