The invention discloses an intelligent transformer substation system grade time characteristic testing device, comprising a data transmission system and a data analysis system. The data transmission system comprises a standard signal collection module, a data processing forwarding module and a synchronization signal output module; the standard signal collection module and the data processing forwarding module are connected to a data analysis system; and the output terminal of the synchronization signal output module is connected to the input terminals of the standard signal collection module and the data processing forwarding module. The invention can realize the time characteristic test on a merging unit to be tested, a protection measurement control device and an intelligent switch device, greatly improves the conditioning speed of the intelligent transformer substation, provides good technical guarantee to the development of the intelligent transformer station, and lays solid foundation to safety stable operation of the intelligent transformer station.