Switching big-parameter bus transfer current device of extra-high voltage disconnector

The invention discloses a switching big-parameter bus transfer current device of an extra-high voltage disconnector, which comprises an auxiliary contact (1), a contact rod (2), an arc extinguish chamber support (3), a shifting fork (4), a vacuum arc extinguish chamber (5), an insulation rod (6), an arc contact (7), a support (8) and an arc contact plate (9). In the invention, the vacuum arc extinguish chamber drives the contact rod by a moving contact to shift the shifting fork of the vacuum arc extinguish chamber so as to realize the switching off/on action of the vacuum arc extinguish chamber; the arc contact plate turns over along with the moving contact so as to realize the switching off/on action with the arc contact, whereas the vacuum arc extinguish chamber is separated from a main through-flow loop when a main switch blade is in normal through flow after being switched on, and thus, flow does not flow through the vacuum arc extinguish chamber, and therefore, damages caused bylong-term through flow of