The utility model provides a 500kV dead end insulator changes follow -up derrick rig, includes support crossbeam and closed board support, both sides are provided with the pulley of location coaster respectively on the support crossbeam, be connected with the arm -tie between the closed board support who corresponds, arm -tie one end and closed card front clip attachment, the other end passes through to block behind load lead screw and the closed card to be connected, be equipped with adjustable jib between support crossbeam and arm -tie, the wire rope handling piece that installed respectively at adjustable jib both ends, parallel lifting rope passes through the wire rope handling piece) be connected with the pulley, install two wide string of some lifting hooks and two narrow string somelifting hook respectively in adjustable jib both sides. The utility model provides a weight skewness when 500kV dead end insulator is changed to the traditional approach, no atress support the operation post, change and take, even the unable problem of accomplishing the operation.