NMR well logging tools achieve the tipping and refocusing of magnetic moment of hydrogen nucleus through highenergy RF pulse and acquire formation information. Limited to the logging cable instantaneous power transfer capability, DC high voltage is sharply dropped while emitting pulse. So tip angle and flip angle aren’t satisfactory, which makes it impossible to effectively excite hydrogen nucleus. According to the characteristics of RF pulse of NMR well logging tools, this thesis designs a kind of energy storage circuit to provide enough power and stable highvoltage output for RF pulse, based on the analysis of energy demand and the principle of negative feedback. In the field application, the realtime curve of Phi_A and RATIO_B show that the circuit successfully ensures the RF pulse emission.