The invention relates to a correction method for a ballastless track structure in a railway tunnel, and belongs to the technical field of railway ballastless track structure defect repair. In the correction method, a wire saw cutting machine is adopted to perform overall horizontal cutting on a proper portion of the ballastless track structure to realize separation between the ballastless track structure and a tunnel invert backfill layer, and temporary supporting and limiting constraining are performed on the cut ballastless track structure; then, lateral pushing correction is performed on the ballastless track structure under the condition of real-time monitoring, and limiting constraining is performed after the ballastless track structure is corrected in place; finally, elevation adjustment, gap filling and bar planting anchorage of the ballastless track structure are completed to realize correction recovery of the ballastless track structure in the tunnel.