The utility model relates to the field of engineering, in particular to a longitudinal temporary connecting structure for mounting a concrete stiffening beam of a suspension bridge. Hoisting rings arepre-buried in the concrete stiffening beams, and perforated lug plates and connecting plates are arranged on the hoisting rings of the adjacent beam sections respectively; the perforated lug plates and the connecting plates are connected through connecting pieces, the connecting pieces are welded to the connecting plate of one concrete stiffening beam, the connecting pieces and the perforated lugplates on the adjacent concrete stiffening beams are fixed through clamping plates and then bolted through high-strength bolts, and a hinge system is formed. On the basis of guaranteeing self-balanceof the concrete stiffening beam in the installation process, the mode that one end is fixedly connected and the other end is hinged is adopted, it is guaranteed that the beam section can freely adaptto linear changes in the whole installation process, the safety and quality controllability in the concrete stiffening beam installation process is greatly improved, the finished bridge line shape iseasy to guarantee, benefits are remarkable, and the effect is good.