The invention provides a method of evaluating the damage of tower slope protection based on real point cloud data, which belongs to the monitoring field. According to the invention, through the installation of a laser three-dimensional scanning device on a ground and through the use of laser radar acquisition technology, real point cloud data with high accuracy and high density in the form of discrete points are obtained so as to obtain the three-dimensional spatial information of the surface of a target scene. When the safety evaluation of the tower foundation is carried out, first of all, according to the actual situation of the tower, the risk points are determined on the selected tower foundation points in a noise removed point cloud picture. Then, through the utilization of basic measurement functions of the modules in specialized processing software, the vertical distance from the foundation points and the risk points is measured and the horizontal distance from the foundation points to the risk points is also measured so as to obtain the vector angle measurement result among the foundation points and the risk points. The technical schemes of the invention can measure with high precision and is able to realize three-dimensional non-contact distance measurement. The measurement result from the invention is credible and can meet the requirement of engineering measurement. The method can be widely used in the areas of suspending power transmission lines and the maintenance and monitoring of tower operations as well.