Power grid communication network switching method and device and power grid communication system

The invention relates to a power grid communication network switching method and device and a power grid communication system. The method comprises the steps: obtaining the geographic position of a first object, and judging whether the first object is located at a ground communication network coverage center or not according to the geographic position of the first object and a preset communicationnetwork coverage area table; when the first object is not located at the coverage center of the ground communication network, determining that a target communication network is a Ka high-throughput satellite network, comparing the target communication network with a communication network accessed last time; when the target communication network is different from the communication network accessedlast time, switching the communication network to the Ka high-throughput satellite network, wherein switching of power grid communication networks in remote areas or model coverage blind areas is realized, and the stability o