An electric-shock-proof insulating guardrail belongs to the technical field of overhaul work electric-shock-proof tools and is a 66 KV electric-shock-proof insulating guardrail mainly used for power distribution lines in 10 KV operation in 66 KV and above overhead transmission line overhaul operation, wherein the power distribution lines run through the same pole tower and are arranged on the same pole tower. The utility model provides the 66 KV electric-shock-proof insulating guardrail which is high in security and easy the dismount. The electric-shock-proof insulating guardrail adopts the following technical solution: the electric-shock-proof insulating guardrail comprises first insulating protection plates, second insulating protection plates, third insulating protection plates, first insulating connection plates, second insulating connection plates, and third insulating connection plates. The electric-shock-proof insulating guardrail is characterized in that the first insulating protection plates are connected with the second insulating protection plates through the first insulating connection plates, the second insulating protection plates are connected with the third insulating protection plates through the second insulating connection plates, the third insulating protection plates are connected with the first insulating protection plates through the third insulating connection plates, and two outer width direction sides of the first insulating protection plates are provided with connecting sheets.