The present invention relates to a power grid switching control method based on a nine-zone graph. The method comprises: obtaining a three-dimensional nine-zone graph; obtaining an operation time; obtaining the operation voltage and operation power factors; obtaining a strategy area associated with the operation time according to the operation voltage and the operation power factors; and executing the switching control according to the strategy area. Because the current load is related to the current operating time quantum, the strategy area associated with the operation time is obtained on the three-dimensional nine-zone graph according to the operation voltage and the operation power factors to match the obtained switching control strategy and the current load of the power grid so as to allow the switching of the capacitor set to be more accurate, effectively avoid the switching concussion and allow the switching effect to be better.