Mining automatic fire extinguishing device

The utility model relates to the technical field of mining fire extinguishing, in particular to a mining automatic fire extinguishing device, which comprises a fire extinguishing transfer trolley, a fire extinguishing agent bearing tank is arranged on the fire extinguishing transfer trolley, a support plate is movably arranged at the top of the fire extinguishing agent bearing tank, a spraying device is arranged on the support plate, and the spraying device is arranged on the fire extinguishing transfer trolley. The fire extinguishing agent bearing tank is connected with the spraying device through a conveying hose; the spraying device comprises an L-shaped rotating conveying pipe, the L-shaped rotating conveying pipe is rotationally limited in a sleeve, the sleeve is fixed to the supporting plate, the input end of the L-shaped rotating conveying pipe is connected with a conveying hose through a rotating connector, and the output end of the conveying hose is fixed to the lower portion of the supporting plate