The embodiment of the invention discloses a method and system for correcting mobile measurement data, and is applied in the technical field of information testing. In the embodiment, the system for correcting the mobile measurement data mainly comprises that correcting values of a plurality of centralized trajectory points of one correcting point are determined according to a deviation value between point clouds corresponding to arbitrary two trajectory points of a mobile measurement carrier and a corresponding relationship between the correcting points of the arbitrary two trajectory points, so that a trajectory of the mobile measurement carrier is corrected, and point cloud data after correction are obtained. Therefore, the system for correcting the mobile measurement data can finally obtain the point cloud data after correction directly through the relationship between the data obtained through the mobile measurement system, correction is performed without a way of manual field data acquisition of control points, and the correction cost can be reduced.