A testing device used for a relay protection device of a zinc oxide lightning arrester comprises six-channel A/D sampling chips, DSP chips, FPGA chips, photoelectric conversion modules and optical fiber interfaces through which three voltage transformers and three current transformers are connected; the outputs of the three voltage transformers and the three current transformers are connected with the corresponding six-channel A/D sampling chips, and simultaneously, the voltage and the currents of three circuits are sampled; the data output of the A/D sampling chips is connected with the DSP chips, the outputs of the DSP chips are connected with the FPGA chips, the outputs of the FPGA chips are connected with the photoelectric conversion modules, the photoelectric conversion modules are driven by the FPGA chips to convert the data into the optical signals which support the preset communication protocol, and are connected with the optical fiber interfaces through the photoelectric conversion modules. More accurate MOV failure waveform files or MOV actual failure wave recording files can be obtained after being simulated by the testing device through the power system simulation software to be imported into the relay protection testing instrument.