This paper presented the high boost ratio of the Marx topology converter whereby the converter is designed based on a principle of the Marx generator concept whereby a high-output voltage is generated from a low-voltage DC source. This principle is realized by charging a number of capacitors in parallel and then suddenly connecting those capacitors in series. Therefore the high efficiency converter can be achieved. The operation of the converter is confirmed by the 3-stage Marx topology converter prototype. The achieved maximum efficiency is 92.2 % at the output power of 500 W and 600 W.