The utility model discloses a system for rapidly treating large-flow combustible gas. The system comprises a trigger igniter, an ignition device, a mounting device and a control system; the mounting device is used for fixing the ignition device in an environment where large-flow combustible gas can be possibly produced; a compound solid propellant grain containing a large amount of metal particles is arranged inside the ignition device; the trigger igniter is connected with the ignition device; a nozzle is arranged on the ignition device and used for ejecting high-temperature energy-containing metal particles; the control device is used for safely and reliably transmitting an ignition instruction to the trigger igniter by use of an ignition control protection circuit. The system for rapidly treating large-flow combustible gas has the advantages that the ignition device capable of instantaneously ejecting the high-temperature gas is arranged to surround a hydrogen discharge hole so that a combustible gas cloud can be quickly combusted at the early stage of formation of the combustible gas cloud, and therefore, detonation of the combustible gas can be avoided; the system has the advantages of safety and quick response.