Track board small-jaw measuring frame and measuring method thereof

The invention provides a high-precision high-speed railway track board small-jaw measuring frame and a measuring method thereof. The track board small-jaw measuring frame comprises a T-shaped frame, wherein a pair of fixed contacts is arranged on two sides of a big end of the T-shaped frame, a prism table is fixed in a corresponding hole in the middle part of a small end of the T-shaped frame, a screw hole adapter is arranged in a corresponding hole in the end part of the small end of the T-shaped frame, an inner hole of a bushing is matched with an outer cylindrical surface of a shell of the screw hole adapter, an inner hole of a cam is matched with an outer cylindrical surface of the bushing in an embedding manner, the pair of fixed contacts pushes against a support rail surface by utilizing the eccentricity of the cam in the rotation process, and the screw hole adapter, the bushing and the cam form a link mechanism. According to the track board small-jaw measuring frame, a geometric state of a track board is adequately simulated, the location problem in the mile direction is solved, relative reliability in location is achieved by utilizing the screw hole adapter, the installation interference caused by a dimensional error and a position error of a track nail hole can be simultaneously avoided, and the center of a ball prism is located on a transverse central plane of a rail sleeper.