An extraction method of obstacle points of an effective flight path for an unmanned plane is disclosed. The method includes S1) a step of determining three-dimensional coordinate information of detected obstacle points; S2) a step of calculating the space distance between each two obstacle points; and S3) a step of eliminating obstacle point outliers of non-effective flight paths and extracting the obstacle points of the effective flight path. The method extracts the obstacle points of the effective flight path for the unmanned plane in a pretreatment process, largely reduces the data amount, and improves the speed and safety for unmanned plane flight path planning.