The invention discloses a high-altitude integral slide device for a jacking platform and a construction method. The method comprises the steps that the slide device is placed in corbel holes of a major structure, and the slide device comprises first slide bodies and second slide bodies slidably arranged above the first slide bodies; box beam corbels of the jacking platform are compacted on the second slide bodies; and ejection devices are installed between the box beam corbels and the major structure and started to eject the jacking platform to move along the slide tracks of the first slide bodies and the second slide bodies. According to the high-altitude integral slide device for the jacking platform and the construction method, the slide device is placed in the corbel holes and horizontally adjusts the displacement of the box beam corbels of the jacking platform placed on the slide device, so that high-altitude major slide of the jacking platform is achieved in the using process under the conditions such as size deviation of the major structure or off-position of the jacking platform, and the phenomenon that the jacking safety of the jacking platform is seriously affected due to friction generated between box beams of the jacking platform and the major structure is avoided.