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[Introduction] Aiming at the problems of long inspection period, high operation intensity and no guarantee of objectivity and integrity of inspection results of the current tree barrier inspection of transmission line, this paper presents a method for three-dimensional modeling of transmission lines and intelligent identification of dangers of tree barriers based on three-dimensional laser point cloud data of fixed-wing UAV. [Method] Point cloud data of transmission lines was collected by three-dimensional laser scanner equipped with fixed wing UAVs, then extracted the power line points in the point cloud and simulate the complete power lines, calculated the euclidean distance between vegetation and power line protection area, and we can get the information of tree barriaer points or early-warning points through comparing the calculated results with the power line safety specifications. [Result] The test results showed that the error of automatic fitting power line is small, which meeted the requirements of tree barrier detection. [Conclusion] This method can extract power lines automatically, quickly and completely, and the extraction accuracy meets the accuracy requirements of tree barrier detection, greatly improved the quality and efficiency of existing tree barrier danger detection method of transmission line.