Rapid power line extraction method based on laser point cloud

The invention relates to a power line rapid extraction method based on laser point cloud. The method specifically comprises the following steps: acquiring point cloud of a power transmission line; marking a target tower; calibrating power line hanging points at two ends; calibrating a power line midpoint; fitting and establishing an XOY linear equation and an XOZ parabolic equation by using the collected point set U1; coordinate points of midpoints M1 and M2 between connecting lines of hanging points O1 and O2 at the two ends of the power line and the midpoint M of the power line are obtained according to the equation established in the step, and a point set U1 is added; and (5) searching point clouds near M1 and M2, adding the point clouds of which the radiuses are smaller than a preset value R into a point set U1, checking whether the point set U1 has repeated point clouds or not, if the repeated point clouds appear, ending power line extraction, and if the repeated point clouds do not appear, entering the