Rapid-mounted fire-retarding device

The utility model discloses a rapid-mounted fire-retarding device which comprises a funnel type linking joint, a fire-retarding piece and a seal fastener, wherein the funnel type linking joint is used for being inserted into an external passage; the fire-retarding piece is arranged in the funnel type linking joint; the seal fastener is used for fixing the fire-retarding piece so as to seal the fire-retarding piece with a funnel; multiple circular through holes are formed in the fire-retarding piece, and through holes are also formed in the seal fastener. According to the utility model, the funnel type linking joint is screwed into the external passage of the shell of an explosion-protected electrical apparatus, an observation hole or a wasted optical cable hole. When the explosion-protected electrical apparatus has sparkles, gas with flames is generated, the hot gas with the flames enters into a gas inlet buffer zone through the through holes in the seal fastener, the fire with the flames is extinguished when