The embodiment of the invention discloses a laser radar point cloud data processing method and device. The laser radar point cloud data processing method comprises the steps: acquiring first point cloud data in an ambient environment of a vehicle; determining second point cloud data in an ROI from the first point cloud data; and on the basis of the second point cloud data, determining informationof obstacles in the ambient environment of the vehicle. Therefore, redundant information, collected by the laser radar, in the ambient information of the vehicle is effectively filtered and only pointcloud data influencing automatic driving of the vehicle need to be processed, so that the processing amount of the point cloud data is reduced and the processing efficiency of the point cloud data isimproved; and thus obstacles in the ambient environment of the vehicle can be quickly recognized and the safe and stable automatic driving of the vehicle is guaranteed.