The utility model provides a high-voltage direct-current bypass switch loop damping structure of an extra-high voltage converter station. The device comprises a first tubular bus, a transition tubularbus, a transition post insulator, a first cross aluminum stranded ring fitting and a high-voltage direct-current bypass switch, the first tubular bus is supported by a first post insulator. the transition post insulator is arranged between the first post insulator and the high-voltage direct-current bypass switch; wherein a conductive connection structure is formed between one end of the first crossed aluminum stranded ring fitting and the high-voltage direct-current bypass switch, a conductive connection structure is formed between the other end of the first crossed aluminum stranded ring fitting and the first tubular bus through a transition tubular bus, and the transition tubular bus is supported through a first post insulator and a transition post insulator. By adopting the high-voltage direct-current bypass switch, the displacement requirement and the electrical connection requirement between power equipment of the high-voltage direct-current bypass switch loop under the earthquake working condition can be well met, so that the anti-seismic property of the high-voltage direct-current bypass switch body and the connecting loop of the high-voltage direct-current bypass switch body is effectively improved.