Independent photoelectric smoke-sensing fire alarm

The utility model provides an independent photoelectric smoke-sensing fire alarm which comprises a top plate, a plurality of through holes are formed in the top plate, an upper shell is arranged at the bottom of the top plate, a lower shell is arranged on the lower portion of the upper shell, and a fire extinguishing agent spraying assembly is arranged at the bottom of the lower shell. A plurality of air inlets are formed in the side wall of the lower shell, a driving motor is arranged in the lower shell, a supporting rod is arranged at the power output end of the driving motor, and cleaning brushes aiming at the air inlets are arranged at the end of the supporting rod; an alarm body and a storage battery for supplying power to the whole alarm are arranged in the lower shell; a pair of L-shaped grooves are formed in the inner side of the upper shell, and a pair of positioning heads in sliding fit with the L-shaped grooves are arranged on the outer side of the lower shell. An elastic telescopic rod is arranged