The FRP temporary crossbar is made of moisture-proof small closed-cell foam filled with high-strength epoxy fiberglass tube as the insulating body, equipped with an insulated O-lock clamp, as well as a lightweight high-strength aviation aluminum holding rod base and nylon with ratchet holding rod locking system. The product has the characteristics of good insulation performance, high mechanical strength, small weight and easy installation and is widely used in temporary wire support tools when working with electricity.