The utility model provides a colliery is collecting space area extinguishing device in pit makes the calcium hydrate saturated aqueous solution apotheca to flow through behind the atomizing nozzle in the inside atomizing of atomizer chamber by the high -pressure pump, the atomizer chamber by a pipe connection on the one port of proportinal flow controller, the inert gas holding vessel by a pipe connection on another port of proportinal flow controller, be provided with spray film nozzle and inert gas nozzle on the shower nozzle. The utility model discloses spray the calcium hydrate solution of saturation to the coal in collecting space area or on taking place the coal of fire to utilize the inert gas nozzle to spray simultaneously, spray the in -process simultaneously at the two, not only can reduce fiery temperature, and, can generate the calcium carbonate film, and in lower of high pressure applies the surface and crack at the coal in collecting space area, thereby utilize chemical method to realize carrying out fundamental outfire to it.