Condensed aerosol fire extinguishing gas generating agent is a solid chemical mixture composed of oxidant, reducing agent, combustion speed control agent and binder. After starting by heat (electricity), the reaction product is cooled and forms agglomerated sol state. Under the action of heat, the fire extinguishing gas Affinity reaction occurs between the sex groups, which repeatedly consumes a large amount of active groups, reduces the burning free radicals, and efficiently absorbs and neutralizes the burning free radicals in the flame, so as to achieve chemical suppression and extinguishing effect.