The invention provides a field verification method of a high-capacity flexible alternating-current power transmission system control strategy. The field verification method covers three aspects, i.e. transition from an initial method to a testing method, disturbance of FACTS element action to grid voltage during testing and control strategy triggering, can coordinately determine a grid initial operating state, a grid operating state before strategy verification testing, a testing target grid operating state, a control strategy fixed value and grid disturbance operation, and can realize full-process control from the grid initial operating state to the testing target operating state. The field verification method of the high-capacity flexible alternating-current power transmission system control strategy can be used for performing field verification to coordinate control strategy of various high-capacity FACTS systems, can check whether elements can correctly act according to control strategy preset logics and conditions or not and can provide a basis for the stable operation of a power system.