The utility model relates to an isolator aerial -working safety auxiliary assembly of transformer substation, specifically speaking are safety belt lift kits of quick installation. There is the defectin current safety belt lift kits structure, is difficult to guarantee that the safety belt lantern ring sets up at the optimum location. The utility model discloses technical scheme is including fixed fixture, pole setting, safety belt link, spiral ejector pin, fixed fixture are a bathtub construction that open side down, the pole setting lower extreme is connected at fixed fixture top, and safety belt link slidable assembles in the pole setting to fix a position through locking mechanism, the perpendicular plate body of fixed fixture one side is equipped with the static pressure piece, and the perpendicular plate body of opposite side is equipped with the spiral ejector pin, and the inboard tip of spiral ejector pin is equipped with the dynamic pressure piece, moves, the pincerlike bayonet socket of the corresponding formation of static pressure piece. The utility model discloses utilizing fixture and safety belt link structural feature, can independently accomplishing the installation by a staff on the framework mesa and lay, fixed position does not receive on -the -spot restriction, has reduced the operation degree of difficulty, has improved work efficiency.