Vacuum arc-extinguishing chamber for on-load tap-changer

The invention discloses a vacuum arc-extinguishing chamber for an on-load tap-changer, which is characterized in that magnetic shells are respectively arranged at the end parts of the opposite side walls of a movable cover plate and a static cover plate, a main shielding case is arranged between the two magnetic shells, and inner shielding cases are respectively arranged in the two ends of the main shielding case; and the two opposite end parts of the movable tube core and the static tube core are positioned in a cavity formed by the main shielding case and the two inner shielding cases when being combined or separated. According to the corrugated pipe, transformer oil in the corrugated pipe is sucked in or discharged out through the oil guide grooves formed in the outer wall of the movable pipe core, the surface area for adsorbing metal steam and the surface area for absorbing and dissipating heat are increased through combination of the inner shielding cover and the main shielding cover, and the corrugated