The invention relates to a waterproof structure used to avoid the water at the surface of joints of cement concrete road and bridge plate to leak into road and bridge, and a method for using waterproof sheet to avoid the surface water at the joints leaked into inner structure, belonging to road project technique. The invention irrigates, adheres or mounts sheet structure on the joints of cement concrete road and bridge, irrigates, adheres or mounts waterproof sheet structure when irrigates or mounts road and bridge plates, while the sheet structure can be plane, or fold shape, with aging resistance and corrosion resistance corresponding to the road and bridge plates. The invention can adapt with deformation and movement of road and bridge plates, to seal and avoid water leaked into road and bridge, with simple structure, easy construction, improved waterproof effect, prolonged service life of road and bridge and improved application property, improved normal traffic time, reduced maintenance and construction costs of road and bridge.