Low-altitude airspace aircraft flight path planning method and device

The embodiment of the invention provides a low-altitude airspace aircraft flight path planning method and device, and is applied to the technical field of low-altitude airspace flight path planning. The method specifically comprises the steps of obtaining a starting point, an ending point, a lowest takeoff elevation and a highest takeoff elevation of a to-be- Determining a flight space range and a DEM data space range according to the starting point and the ending point, and dividing the flight space range and the DEM data space range; according to the pixel elevation of each divided strip and the lowest and highest takeoff elevations, determining a flight area and a non-flight area; further determining a flying point set and a non-flying point set; solving rays of all points in the non-flying point set to obtain a target ray set; according to the points intersecting with the rays in the target ray set in the flight area, updating the flight point set, and determining the points which can be added into the fl