The invention relates to a simulation measurement method before operation of a transient state phase-controlled strong current generator and secondary equipment. The method is characterized by comprising the following steps: (1) firstly acquiring a running interval or a single-phase reference voltage of a bus voltage transformer at a site meeting voltage acquisition conditions by virtue of a wireless voltage acquiring and transmitting module, and performing total-station reference voltage signal coverage broadcasting by adopting a wireless radio manner after acquisition; and (2) when the transient state phase-controlled strong current generator receives a wireless reference voltage signal in real time, taking a reference voltage received wirelessly as a phase control benchmark, and outputting a transient state current in phase control of the reference voltage to be used for being injected into a tested current transformer, wherein a transient state current induced and obtained at a secondary side of the current transformer flows into a corresponding protection device and measurement control equipment. The method provided by the invention effectively improves power grid operation reliability and safety.