An explosion-venting method for an aerosol fire suppression apparatus, wherein the aerosol fire suppression apparatus comprise a cylinder body and a cylinder cover assembly arranged on the front end of the cylinder body; an explosion-venting device matched with the aerosol fire suppression apparatus comprises a friction layer, a connecting rod, a guiding unit, a flanging, a clamping claw and a buffering component; the friction layer is arranged between the connecting rod and an outer wall of the cylinder body; the guiding unit is able to guide the connecting rod when the connecting rod is moving; the guiding unit is a guiding ring fixedly connected with the connecting rod or a guiding groove arranged on the outer wall of the cylinder body and capable of making the connecting rod slide along the guiding groove; the connecting rod is fixed on the outer wall of the cylinder body by the clamping claw and is fixedly connected with the cylinder cover assembly; the clamping claw is arranged on one end, which is arranged with a nozzle, of the aerosol fire suppression apparatus; the flanging fixedly connected with a nozzle end of the aerosol fire suppression apparatus and capable of stopping the extremity of the connecting rod from being separated from the cylinder body; the buffering component is further arranged between the flanging and the guiding ring; characterized in that, the method comprises the following steps: 1) when the aerosol fire suppression apparatus deflagrates and the clamping claw is detached, the connecting rod and the cylinder cover assembly moves a limited displacement in a direction that a hot air stream of the aerosol fire suppression apparatus is jetting towards; when the connecting rod is guided by the guiding unit to displace along an outer wall of the cylinder body of the aerosol fire suppression apparatus toward a direction that a hot air stream is jetting towards, the friction layer generates a frictional resistance at the moment because an elastic effect of the friction layer acts on the connecting rod and the outer wall of the cylinder body; 2) when an extremity of the connecting rod reaches an edge of the front end of the cylinder body, being limited, the connecting rod stops the displacement along the direction that the hot air stream of the aerosol fire suppression apparatus is jetting towards, thus achieving for the aerosol fire suppression apparatus the purpose of explosion-venting, wherein the buffering component is to buffer a collision force between the extremity of the connecting rod and the front end of the cylinder body of the aerosol fire suppression apparatus, and consume a part of motion kinetic energy with an elastic effect of itself; a part of kinetic energy is consumed by overcoming a strength resistance of the flanging which has certain strength. 1) when the aerosol fire suppression apparatus deflagrates and the clamping claw is detached, the connecting rod and the cylinder cover assembly moves a limited displacement in a direction that a hot air stream of the aerosol fire suppression apparatus is jetting towards; when the connecting rod is guided by the guiding unit to displace along an outer wall of the cylinder body of the aerosol fire suppression apparatus toward a direction that a hot air stream is jetting towards, the friction layer generates a frictional resistance at the moment because an elastic effect of the friction layer acts on the connecting rod and the outer wall of the cylinder body; 2) when an extremity of the connecting rod reaches an edge of the front end of the cylinder body, being limited, the connecting rod stops the displacement along the direction that the hot air stream of the aerosol fire suppression apparatus is jetting towards, thus achieving for the aerosol fire suppression apparatus the purpose of explosion-venting, wherein the buffering component is to buffer a collision force between the extremity of the connecting rod and the front end of the cylinder body of the aerosol fire suppression apparatus, and consume a part of motion kinetic energy with an elastic effect of itself; a part of kinetic energy is consumed by overcoming a strength resistance of the flanging which has certain strength.