The invention provides an insulating hanging rack and a telescopic clamp for electrified connection and an operation method. The insulating hanging rack comprises a top end hanging seat, a lower end clamping seat, a hanging arm, a hanging arm fixing frame, a fixed clamp, a movable clamp, a locking switch, an outer sleeve, an inner pipe, a spring clamping sleeve and a pressure spring. The insulating hanging rack can be hung on large and small cross arm angle steel of two specifications, so that an operator keeps a certain distance from an electrified body. The insulating hanging rack is made ofinsulating materials, which provides safety guarantee for high-altitude live working. The telescopic clamp comprises a melon head, an outer pipe, an inner pipe, an inner pipe stretching grip, an outer pipe grip, an extrusion sliding block, a telescopic rod, a hanging seat, a pressure spring clamping sleeve, a pressure spring, a jackscrew and a steel ball. The telescopic clamp can be used for clamping and locking tools with different section shapes, is mainly used for transferring tools or cables to aloft work personnel by workers on the ground, is simple to operate, convenient to carry and firm in clamping, protects the tools, and is suitable for narrow areas where a lift truck cannot enter and being used with the insulating hanging rack.