Explosion venting mechanism of coal and gas outburst simulator

The utility model discloses an explosion venting mechanism of a coal and gas outburst simulator. The explosion venting mechanism comprises an outburst box 1, wherein a counterbore 1b is formed in the middle of the outburst box 1 along the vertical direction; a horizontal explosion venting bore 1a communicated with the counterbore 1b is formed in the side wall of the outburst box 1; a horizontal through hole 1c is also formed in the side wall of the outburst box 1 beside the counterbore 1b; the radius of the explosion venting bore 1a is greater than the vertical distance between the center of the explosion venting bore 1a and the counterbore 1b; the radius of the through hole 1c is smaller than the vertical distance between the center of the through hole 1c and the bottom of the counterbore 1b; an explosion venting baffle 2 is installed on the explosion venting bore 1a; a baffle 3 is inserted into the counterbore 1b and pushes against the explosion venting baffle 2; the upper end of the baffle 3 is connected w