High-frequency DC/DC converter used in underground coal mine waste large energy, and it doesn't anti-high voltage, so, it is unstable. In order to solve these problems, proposed one kind of new design of Double Switching Forward DC/DC converter. The test result and the practical application indicated. The new converter has many merits, including anti-high voltage, high frequency, high stability, loss Low. So, the new converter has certain economic value and the practical value.