The invention provides an intelligent pesticide delivery unmanned helicopter, and belongs to the technical field of agriculture plant protection. The unmanned helicopter comprises a helicopter body frame, a rotor wing flight system and an undercarriage assembly, wherein the helicopter body frame is provided with an onboard electric system which comprises a flight control unit, a GPS (Global Position System), a course meter, a miniature inertia measurement assembly, a measurement and control link, a steering engine controller and a power supply system, wherein the communication end of the flight control unit is connected with the magnetic course meter, the miniature inertia measurement assembly, the steering engine controller and the GPS in a communication way; the communication end of the flight control unit communicates with a measurement and control ground station by an onboard radio station; the control output end of the flight control unit is connected with the steering engine controller which controls the rotor wing flight system; a pesticide delivery device composed of a pesticide box, a liquid pump, a spray boom and a sprayer is mounted in the middle of the helicopter body frame. The unmanned helicopter is capable of realizing automatic navigation flight and automatic control on pesticide delivery operation.