Abstract: For reducing the serious consequences of horn sparks and too little sound and other factors in coal mine, by using non-contact, electromagnetic effect and insulation glue sealing method, the article designed a contactless explosion-proof electromagnetic horn. Simulation and testing results showed that horn circuit met the requirements of intrinsically safe circuit, and it was a safe and reliable, long service life, good sound effect, multiple input voltage, explosion-proof loudspeaker without contact with mine locomotive.