Abstract: In order to improve the steady-state accuracy of energy-feedback DC electronic load and broaden the voltage input range, a new load analog converter AB complementary Buck-Boost converter was proposed. Based on the idea of interleaving and complementary ripple elimination, the new converter was designed as two parts of A-type and B-type circuits. The A-type circuit adopts the traditional four transistor Buck-Boost topology. In the switching cycle, the inductor current waveform was point symmetrical by phase shifting the driving waveform; On the basis of A-type circuit, B-type circuit adds a totem pole in the buck stage and boost stage respectively. Through the control of the driving waveforms of the four totem poles, the point symmetrical inductance current waveform complementary to the inductance current of type a circuit was generated in the switching cycle, so as to realize the mutual cancellation of inductance ripple. With the help of Simulink platform, the simulation models of traditional Buck-Boost converter and AB complementary Buck-Boost converter were built, and the current ripple of the two converters were compared under the same simulation parameters. The results show that the suppression effect of AB complementary Buck-Boost converter on current ripple is significantly better than that of traditional four switch Buck-Boost circuit. At the same time, compared with ordinary boost load analog converter, its boost ratio range is widened from 1-9 to 0.12-9.99.