The transient step characteristic of the DC voltage transformer is very important to the control and protection device of the DC system. In this article, firstly, the factors affecting the transient transmission characteristics of DC electronic voltage transformers are studied. The technical parameters of step response and the performance requirements of the test device are analyzed. Based on this, a field test method for the step response characteristics of the DC voltage transformer is proposed. A step voltage source and test device based on a solid-state switch are developed. The synchronous measurement of steep rise, long pulse width square wave voltage output, and transient signal are realized. The test results show that the proposed field test method and device of step response characteristics of the DC electronic voltage transformer meet the requirements of the standard. The field test of step response is carried out in the actual ± 500 kV DC project converter station, which provides a technical basis for the transient performance test and evaluation of the DC voltage transformer.