Coal mine underground fire extinguishing device

The invention discloses an underground coal mine fire extinguishing device and relates to the field of underground coal mine fire extinguishing equipment and a mine, the side face of the mine is fixedly connected with a connecting part, the side, away from the connecting part, of the mine is fixedly connected with a covering part, and the bottom of the inner wall of the mine is evenly provided with via holes and spraying parts. According to the mine fire extinguishing device, the fire extinguishing mechanism is arranged, when open fire occurs in a mine hole, the surrounding environment rises, liquid in a glass bulb begins to expand, and when the liquid expands to a certain degree, the glass bulb is broken, so that water in a water pipe reaches a connecting box through a connecting pipe to be sprayed; the water flow spraying range is diffused through continuous impact of water flow and the support, so that spraying fire reduction is conducted on the open fire position of a mine, and fire extinguishing work is