Rail position measuring tool

The utility model provides a track position measuring tool, comprising a base block which is arranged on a track in a manner of moving on the upper surface of the track, and the lower surface of the base block is attached to the upper surface of the track; the target piece is attached to the base block, a target center is arranged on the target piece, and the target center is located on the vertical center plane of the track; and the stop block is arranged on the rail and used for limiting the base block to move along the rail center line of the upper surface of the rail. According to the track position measuring tool provided by the utility model, the coordinates of a plurality of measuring points on the track can be measured through the same base block, so that the errors of the measuring points are the same, the errors among different measuring points can be mutually offset, the accuracy of straightness can be greatly improved, and the position measurement of a crane track can be quickly and accurately car