Radio wave penetration is currently one of the most effective technical means for detecting geological anomalies. With the increase in width of the working surface, the penetration distance of commercially available detection instruments cannot meet the needs of detecting the working surface over 200m. For obtaining a greater penetration distance, it is a difficult task for radio wave transmission technology to further improve the transmitting efficiency and transmit electromagnetic wave signals with stable amplitude. In this paper, the intrinsically safe power supply protection technology, design of intrinsically safe power supply circuit, and protection and testing of intrinsically safe power supply are studied according to explosion-proof standard requirements in GB/T 3836.4. The results show that the intrinsically safe power supply protection circuit is effective in providing protection, with the pulse energy lower than the specified value; therefore, the intrinsically safe power supply meet the explosion-proof requirements stated in the national explosion-proof standard.