Abstract: Aiming at the shortcomings of the current coal mine explosion venting devices, a new explosion venting door is designed, and its structure, explosion venting mechanism and beneficial efficiency enhancement are discussed. FLUENT software was used to simulate gas explosion under different working conditions and the change laws of explosion pressure, flame temperature and flame speed were analyzed by monitoring, and the explosion venting effect of the explosion vent door was verified. The results show that when the gas mass fraction is 9.5%, it is found that the explosion pressure peak generated by the explosion-proof wall is the largest, and the pressure is maintained at 0.29 MPa after attenuation, and the surrounding rock and equipment in the roadway are continuously damaged under high-pressure environment. The explosion venting door can quickly release the pressure, so that the fire area can be closed without fresh air, and reduce the occurrence of secondary explosions and secondary disasters. Under the working condition of gas mass fraction 5.5%-11.5%, the overall change law of gas explosion characteristic parameters is the same. As the gas volume fraction increases, the gas explosion characteristic parameters first increase and then decrease. The explosion venting capacity of the explosion venting door has nothing to do with the gas volume fraction, however the gas volume fraction changes, the pressure is released and the fire area is closed at the same time.