Pesticide spraying device

The invention discloses a pesticide spraying device which comprises a support, a disc and a rotary nozzle, wherein the disc is fixedly connected with the support, the rotary nozzle is rotationally connected with the support through the top of the rotary nozzle, blades are arranged at the lower end of the rotary nozzle, the disc sleeves the rotary nozzle through a through hole, a liquid spraying opening of the rotary nozzle is located above the disc, and the blades are located below the disc; a plurality of small holes are formed in the disc, and a uniform smearing rod is horizontally and fixedly arranged on the rotary nozzle and makes contact with the upper surface of the disc; a cavity of the rotary nozzle communicates with a water outlet of a water pump through a water pipe, and a water inlet of the water pump communicates with a liquid storage barrel; a water pipe is rotationally and hermetically connected with the bottom of the rotary nozzle; and a liquid insecticide is stored in the liquid storage barrel