The invention discloses a standard device for calibrating a high voltage relative dielectric loss and capacitance tester. The device includes a control module, a synchronization signal generator and asignal processing module. The control module is used for sending a control signal to a synchronization signal generation module according to a received instruction; the synchronization signal generator includes a DDS chip with two synchronization channels, the synchronization signal generator is used for generating a first signal and a second signal with the same waveform through the DDS chip according to a received control signal; the signal processing module includes a filter circuit, a voltage current conversion circuit and a power amplification circuit; the voltage current conversion circuit is configured to convert voltage signals of the first signal and the second signal into corresponding current signals, and the power amplification circuit amplifies the current signals to match the input requirements of the high voltage relative dielectric loss and capacitance tester. The system and method are high in safety factor, and the system is convenient to carry.