The invention relates to a voltage ride-through testing system and method. A working voltage is switched rapidly; and working performances of a frequency converter in an instantaneous over-voltage state and an instantaneous low-voltage state are tested. The testing system comprises an adjustable transformer, a tap switch, a frequency converter, an adjustable load, and a control recording instrument. Five taps are arranged at the output terminal of the adjustable transformer; and five kinds of voltages with different amplitudes are led out respectively. The tap switch consists of eight input terminals and one output terminal and is controlled by an artificial or program control instrument; and the eight input terminals are connected with five taps of the output terminal of the adjustable transformer. The frequency converter is connected with tap switch. The adjustable load is connected with the frequency converter; and the value of the adjustable load is adjusted based on different output voltages of the frequency converter. The control recording instrument connected with the adjustable transformer, the tap switch, the frequency converter, and the adjustable load is used for controlling working states of the adjustable transformer, the tap switch, and the frequency converter and collecting input and output voltages, a current waveform, and a switch protection actuating signal of the frequency converter. Therefore, safe, reliable, high-efficiency, and normal operation of the frequency converter of the power plant can be guaranteed; and the shutdown accident is avoided.