Abstract: ZYBG type automatic explosion suppression device of mine-used gas transmission pipeline was developed by use of active explosion suppression technology in order to guarantee safety of the gas transmission pipeline. The device adopts flame sensor to detect gas explosion signal, transmits the signal to controller through photoelectric conversion, and controller makes determination and analysis for the signal. In the moment of explosion closes to the protection range, the controller opens high pressure explosion suppressor quickly and release explosion suppression medium to extinguish the flame, so as to prevent further spread of the explosion. The test results of explosion suppression performance show that the explosion suppression device can capture flame information within 5 ms, and sprinkle explosion suppression medium within 35 ms.