Wireless power transfer (WPT) technology has efficiently overcome the drawbacks of traditional contact-type power transfer mode,if it can be applied in the high dust environment,it will certainly reduce the safety problems caused by electric spark,thereby enhancing the security of mining production.For the safety of coal mine electrical equipment flexible power supply problem,combined with the specific electrical environment of coal mine,a wireless power supply system used in coal mine was put forward,and the high frequency electromagnetic field induces gas explosion mechanism was studied,from which,the magnetic energy capacity restricted condition was also set up,which can realize the security applications of WPT system in high gas mine.