The utility model discloses a how much state precision measurement systems of railway rails, including measuring the dolly, measuring the dolly and including first crossbeam, second crossbeam and third crossbeam, the one end of first crossbeam and second crossbeam connects to form Y type frame with the third crossbeam respectively, the other end of first crossbeam and second crossbeam is equipped with the brake wheel respectively, the end of third crossbeam is equipped with locating wheel subassembly and flower piece wheel, the backup pad has been erect between first crossbeam and the second crossbeam, be equipped with hand push subassembly, electrical apparatus case and sensor on the third crossbeam, be equipped with the mounting platform on the frame that first crossbeam, second crossbeam and backup pad are enclosed, be fixed with the inertial navigation appearance on the mounting platform, be equipped with a GPS antenna in the backup pad, the inertial navigation appearance passes through the data acquisition connection and is connected with the electrical apparatus case. The utility model discloses based on inertial navigation and "Global position" technique, the precision measurement of railway rails geometry states has been realized.