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The current power IoT system uses the Zigbee protocol. This agreement cannot meet the IPV6 requirements of the MAC layer of IEE802.15.4, resulting in a low current transmission rate and failure of the voltage over-limit switch control. To this end, the 6LoWPAN protocol is used to optimize the gateway function of the power IoT system. Based on the 6LoWPAN technology principle, application specifications, and advantages compared to other Internet of Things, based on the network layer protocol of IEE802.15.4, Zigbee and 6LoWPAN coexist, and the protocol middle layer is the overall design of the dual protocol stack gateway to realize the Internet of Things and IPv6 Internet interconnection and information exchange. The 6LoWPAN adaptation layer is designed to solve the problem that the MAC layer of IEE802.15.4 cannot meet the requirements of IPv6. The simulation results show that the connectivity performance of the power IoT system and the UDP datagram transmission performance after applying the 6LoWPAN protocol meet the actual application requirements; the application of the 6LoWPAN protocol can significantly improve the battery life of the data collection node, reduce power consumption, increase the current transmission rate, and improve Success rate of voltage over-limit switch control. The application of 6LoWPAN protocol can effectively improve the level of safe operation of the power grid.