The invention relates to the field of railway roadbed engineering, in particular to a repair method for high-speed railway roadbed arching deformation. A working groove/working grooves meeting the drilling machine drilling operation requirement is/are excavated in one side/two sides of an arching section roadbed; then holes are transversely drilled in the arching section roadbed range, and round pipes with the diameter equivalent to the hole diameter are inserted in the drilling process; along with the increase of the number of the drilled holes, the up-down contact area of a soil body of a layer where the drilled holes are located is reduced, soil body stress concentration is generated, the portions, around the hole walls, of the soil body are squeezed into or collapse into the drilled holes, and roadbed settlement is generated; then, the mode that small-diameter round pipes are used for gradually replacing the large-diameter round pipes is adopted for guaranteeing that roadbed settlement deformation is in a controllable range, and the round pipes inserted in the drilled holes at the last time are used as grouting pipes; after the settlement deformation generated by the roadbed drives the rail surface elevation to reduce to a target value, the drilled holes are filled with cement paste or cement mortar through the grouting pipes; and finally the working groove/working groovesis/are backfilled. By the adoption of the method, construction is convenient and quick, cost is low, normal operation of a railway is not affected, and the method is more practical.