The invention discloses a photoelectric converter for tests. The photoelectric converter for tests includes a photoelectric isolation module, a signal processing module, and an electronic-to-optical conversion module, wherein the photoelectric isolation module is used for converting an initial electric signal into an optical signal, and processing the optical signal into a processed electric signal to output to realize isolation of the initial electric signal; the input terminal of the signal processing module is connected with the output terminal of the photoelectric isolation module for performing logical operation on the processed electric signal and converting the processed electric signal into four-path control signals; and the input terminal of the electronic-to-optical conversion module is connected with the output terminal of the signal processing module for converting the four-path control signals into four-path optical signals to output. The photoelectric converter for testscan perform photoelectric isolation on the input signal through the photoelectric isolation module, can isolate the voltage signal output from a voltage controller through a power supply module, so that the inside of the module and the outside have no electrical connection. When a 160kV high voltage direct current breaker type test is performed, the photoelectric converter for tests can effectively isolate the external electric signals to prevent the interference influence of jump-in of high voltage of the test loop on the control module.