Safe pesticide spraying device and using method thereof

The invention discloses a safe pesticide spraying device and a using method thereof. The safe pesticide spraying device is characterized by comprising a telescopic spraying rod, wherein a sprayer is arranged at one end of the telescopic spraying rod; a first supporting block is arranged at the other end of the telescopic spraying rod; a rotating wheel and a motor are arranged on the first supporting block; the rotating wheel is connected with the motor by a belt; the rotating wheel is provided with a rotating shaft; a second supporting block is arranged on the upper surface of the rotating wheel; the rotating wheel is positioned between the first supporting block and the second supporting block; the rotating wheel is provided with the rotating shaft; the rotating shaft successively penetrates through a spring, a first friction plate, a second friction plate and a rotating plate; the second friction plate is connected with the rotating plate; the rotating plate is provided with fan blades; and the motor is con