In order to evaluate the insulation performance of converter motor windings reasonably, the International Electrotechnical Commission (IEC) released two standards and recommended to evaluation the insulation by using repetitive impulsive voltage. The voltage parameters can significantly influence insulation lifetime, and thus, voltage parameters should be carefully controlled during the experiments. Firstly, the waveform parameters selection method is analyzed in this paper. Secondly, the development process of this generator is introduced in detail. Finally, this paper gives the calculation method of key parameters of pulse conversion main circuit. The measurement results show that this generator can output pulse square wave with symmetrical pulse edge characteristics. By controlling the semi-solid-state switch and adjusting the charge/ discharge parameters, a symmetrical pulse square wave with the shortest pulse edge time of 20 ns, the maximum continuous repetition frequency of 20 kHz and the maximum voltage amplitude of 10 kV can be obtained. This generator is reliable in operation, simple in structure and stable in output waveform. It can be used to evaluate the insulation performance of convertor motor under pulse voltage conditions.