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In order to solve the problem that the surge suppression function failed at the moment of spacesuit power switching with load, an improved method for surge suppression was proposed. The fast discharge path of MOS gate voltage was added, the relatively isolated charging circuit and discharging circuit were designed, and the parameters of resistance and capacitance were determined through analysis and calculation. The simulation and calculation results showed that the discharge time of MOS gate voltage was reduced from 48.55 ms to 554.5 μs, and the charge time was changed from 90 ms to 42 ms, the discharge time was accelerated while the charge time was stable. The test results showed that the peak current was no more than 3 A at the moment of initial power on and power switching, which indicated that the surge current could be suppressed under both conditions. The improved surge suppression circuit could effectively solve the problem of excessive surge current in power switching with load, and could be applied to the power supply system of spacesuit.