Unmanned combine harvester path planning method and system

The invention relates to a path planning method and system for an unmanned combine harvester, and the method comprises the steps: firstly calculating the number of unloading times according to the crop yield and the volume of a grain tank of the harvester, then calculating the single operation area according to the number of unloading times, and calculating the number of operation times needed by the single operation area according to the operation width of the harvester; the operation frequency is an even number upwards; determining a single operation breadth according to the operation times, and determining an operation path; the operation path comprises a straight path, a U-turn path and a grain unloading position; the U-turn path is used for carrying out fishtail line U-turn at the end point of each straight path; the grain unloading point is the end point of the last straight path in the single operation area, and the number of times of operation is an even number upwards, so that the end point of the la