The utility model provides an insulator chain protective structure, including hanging the support and hanging the insulator chain under hanging the support, hang the support upper berth and be equipped with the confined occlusion part, the occlusion part for antirustly lose, waterproof, ageing -resistant material. It is current because of the bird pest tripping operation in order to solve the circuit, just reduce the frozen volume on the insulator chain to avoid the circuit to cause circuit short circuit tripping operation scheduling problem because of insulator chain freezes in a large number, improve transmission line's service reliability. The utility model belongs to defeated electrical safety field.