High-pressure water mist fire extinguishing device is an advanced firefighting equipment. It can produce very fine water mist through high-pressure pumps and nozzles. The fine water mist has a large contact area with the fire source, which can effectively cool down the combustion area, suppress the combustion reaction, and cut off the oxygen supply. This device is suitable for various fire scenarios such as electrical fires, because the fine water mist is less likely to cause electrical short circuits than traditional fire-based fire extinguishing methods. It also has the advantages of low water consumption and less environmental damage and protected objects.