A structure for a composite temporary bridge integrated with a main girder and a deck plate and a construction method of a composite temporary bridge using the same are provided to obtain structural safety although a cross beam or a bracing is not set up and to prevent the structure from sagging due to the weight by increasing the section hardness of the main girder and the deck plate. A composite temporary bridge comprises a main girder(100), a supporting plate(200), a finishing plate(300), a plurality of rib plates(400), and a structure(550) for the composite temporary bridge. The main girder is installed in the longitudinal direction of the bridge. The supporting plate is installed at the upper side of the main girder. The finishing plate is installed at the end of the front side and the rear side of the supporting plates. A plurality of rib plates is installed in the regular interval between the anterior finishing plate and back side finishing plate. The structure for a composite temporary bridge comprises a cover plate(500). The cover plate is inserted into the upper end of the rib plate.
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