The invention discloses a method used for extracting each appearance detection item of a CRTSIII type track board. The method comprises steps that S1, a cement inspection pedestal is casted, and the cement inspection pedestal is disposed on the to-be-detected CRTSIII type track board; cement piers are casted and are mounted on a KUKA robot; S2, a data acquisition subsystem is composed of the KUKArobot and a 3D imager, the surface of each bearing platform of the finished CRTSIII type track board and the middle surface of each of left and right sides of the track board flatly arranged on the ground are acquired, and high-quality point cloud data of a part of the bottom surface is further acquired.