Pesticide spraying machine suitable for long-stalked crops

The invention discloses a pesticide spraying machine suitable for long-stalked crops. The pesticide spraying machine suitable for long-stalked crops comprises a vehicle body support, wherein a power vehicle, a pesticide box and a foldable extension rack are arranged on the vehicle body support; a mechanical chain transmission mechanism is arranged between a vehicle body tire and a vehicle body driving axle of the power vehicle; the mechanical chain transmission mechanism comprises a first chain wheel which is mounted on the vehicle body driving axle in a sleeving manner and a second chain wheel which is mounted on a corresponding vehicle body tire driving shaft in a sleeving manner; a chain is mounted between the first chain wheel and the second chain wheel in a sleeving manner; and the diameter of the first chain wheel is greater than that of the second chain wheel. Kinetic energy transmission is carried out by the mechanical chain transmission mechanism, under the condition that a wheel with an overlarge di