Automatic fire extinguishing device

The utility model provides an automatic fire extinguishing device, relating to the technical field of the fire extinguishing device. The automatic fire extinguishing device comprises a dry powder fire extinguishing agent pot and a lengthened spraying pipe connected with an outlet end of the dry powder fire extinguishing agent pot, and is characterized in that the dry powder fire extinguishing agent pot is internally provided with fire extinguishing agent dry powder and a high-pressure gas slowly-releasing pot; the high-pressure gas slowly-releasing pot is internally provided with a gas generator shell; a fuel output opening is arranged at one end of the gas generator shell; the bottom of the dry powder fire extinguishing agent pot is connected with a bottom cover; the high-pressure gas slowly-releasing pot and the gas generator shell are connected with a large bolt welded at the center of the bottom cover through a thread buckle; an ignition line is led out from the bottom of the gas generator shell; the igni