Railway construction site area intrusion detection method and system based on three-dimensional point cloud

The invention provides a railway construction site area intrusion detection method and system based on a three-dimensional point cloud, and the method comprises the steps: collecting the three-dimensional point cloud data of a railway construction site area through employing a laser radar, carrying out the preprocessing of the three-dimensional point cloud data of a current frame, and extracting the effective information in the three-dimensional point cloud; before detection is started, region division is carried out on the collected three-dimensional point cloud data in the whole scene, and the boundary of a safe region and a dangerous region is marked; detecting a moving target located in a dangerous area in the three-dimensional scene; the detected moving target is tracked; all moving targets are judged through a preset intrusion rule, and when a target is found to strike the intrusion rule, intrusion information is sent to the alarm module to trigger an alarm. According to the invention, the dangerous are