The invention relates to a movable and static contact connection assembly and a high-voltage isolation grounding switch thereof. The movable and static contact connection assembly comprises a movable contact and a static contact which are inserted and matched correspondingly; the static contact comprises a static contact finger and a static arc contact which is arranged axially at the center of astatic contact seat; the static arc contact is provided with a cylindrical contact lever which extends axially and is integrated circumferentially; the center of the matched end part of the movable contact and the static contact finger is provided with a mounting hole extending axially; the mounting hole is internally provided with a hollow columnar movable arc contact which is inserted and matched with the contact lever of the static arc contact in switching on; and the static arc contact and the active arc contact are inserted, contacted and matched. The integral cylindrical structure is adopted for the static arc contact arranged on the movable and static contact connection assembly and the high-voltage isolation grounding switch static contact, also the movable contact is internally provided with a corresponding inserted and matched structure, the reduction of the strength of structure of the static arc contact caused by the splitting of the static contact finger for the opening on the static arc contact is avoided, and simultaneously the problem of in accurate excess of stroke after deformation is avoided caused by the easily-deformed pin finger on the static arc contact.