Platform door insulation device

The utility model provides a platform door insulation device which comprises an equipotential cable arranged between a platform door and a steel rail and a rail potential limiting device arranged between the steel rail and the ground, the equipotential cable is sequentially connected with a rail connecting line contactor, a grounding contactor, a voltage transmitter and a PLC cabinet in series, and the PLC cabinet is electrically connected with the voltage transmitter. The voltage transmitter is electrically connected with the grounding contactor, the grounding contactor is electrically connected with the rail connecting line contactor, and the PLC cabinet is in communication connection with the grounding contactor, the rail connecting line contactor and the rail potential limiting device. The device has the beneficial effects that the platform door and the steel rail are in equipotential connection, so that no potential difference exists between a train and the platform door, and passengers are prevented fro