The utility model provides a high-frequency current source. The high-frequency current source comprises an FPGA module, a first digital-to-analog conversion module, a second digital-to-analog conversion module and a power electronic current generator, the FPGA module is used for receiving a direct-current amplitude control signal in proportional relation with the amplitude of the sampling signal and an alternating-current frequency control signal with the same frequency as the sampling signal, and completing encoding output and sending time sequence control of the direct-current amplitude control signal and the alternating-current frequency control signal; generating a direct-current voltage analog signal through a first digital-to-analog conversion module; generating an AC voltage analogsignal through a second digital-to-analog conversion module; and a high-frequency current signal is output through the power electronic current generator. By combining a conventional analog power amplifier test method and good high-frequency output characteristics of the digital current source, frequency response precision, filtering cut-off frequency, frequency aliasing and other frequency characteristic tests of the direct-current electronic transformer can be carried out.