Steel rail curvature detection tool

The utility model relates to the technical field of steel rails, in particular to a steel rail curvature detection tool. The digital template ruler comprises a digital template ruler which comprises a long-strip-shaped ruler body. The left end and the right end of the bottom side of the ruler body are respectively provided with a notch used for placing an auxiliary detection device, and positioning protrusions are respectively formed at the positions, corresponding to the notches, of the ruler body. A plurality of displacement sensors are arranged in the middle of the bottom side of the ruler body at intervals, an attitude sensor and a controller are arranged in the ruler body, a display screen is installed on the ruler body, and the display screen is electrically connected with the displacement sensors and the attitude sensor through the controller. Compared with the prior art, the detection tool is simple in structure and convenient to operate, the straightness and the arc size of the steel rail can be auto