In order to meet the high efficiency and small size of neutron tube ion source power supply, a technical solution of series resonant push-pull double voltage converter is designed. This converter utilizes the parasitic parameters of Metal-Oxide-Semiconductor Field-Effect Transistor(MOSFET) to eliminate the parasitic oscillation of the circuit, and uses the voltage doubler capacitor as the resonant element to realize the zero voltage current switching(ZVCS) of the switch to reduce the loss. The first wave analysis method was used to establish the voltage gain mathematical model to reflect the influence of the resonance quality factor on the voltage gain. A parameter design method suitable for a push-pull LC resonant voltage doubler circuit is given. A 50W prototype was simulated and manufactured using saber software to verify the correctness of the principle and theoretical analysis of the converter.