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The 21st century is the era of rapid development of information. energy technology is the core of world development. With the excessive consumption of energy in the world, new energy technologies are being developed all over the world, and new energy vehicles as their representatives have developed rapidly. battery and charge-discharge technology is one of the core technologies to limit new energy vehicles. and introduces the development status and future development trend of new energy vehicles at home and abroad, and points out the hot issues in the research of double resonance DC / DC converters. The double resonant DC / DC converter is used as the topology structure of this design converter, and the basic parameters of the double resonant DC / DC converter are determined according to the design requirements. the simulation model of the resonant DC / DC converter is established by MATLAB / Simulink, and the control of the resonant DC / DC converter is achieved by digital control, and its positive and negative working waveforms are analyzed, which proves the effectiveness and feasibility of the use of the double resonant DC / DC converter in automobiles. it can simplify the control structure of electric vehicles and improve the running efficiency of the whole vehicle.