Abstract: Plant protection drones are an effective method for pest control in the field. With China’s agricultural production tending to mechanization, intelligence, plant protection unmanned aircraft application technology began to rise. This paper analyzes the application advantages of domestic and foreign plant protection unmanned aircraft in flight control technology, air route planning, research on air washing flow under rotors, field plant protection technology and safety application technical specifications, the research progress of plant protection drone application technology is combing. Analysis of the main problems facing development: There are not many enterprises with flight control research and development capabilities, the requirements of route planning are getting higher and higher, the air washing flow under the rotor is not enough to study the motion law of fog droplets, the core technical theory in electrostatic application system is not studied enough.et al. At the same time, the composite control method of plant protection unmanned aircraft is summarized, real-time route planning, distribution characteristics of air wash air flow under spatial and two time dimensions, multi-machine cooperation is the next few major development trends. It provides reference for the promotion and application of plant protection unmanned aircraft.