Digital display detecting device and detecting method for relative height difference of railway line steel rail top surfaces

The invention provides a digital display detecting device and detecting method for relative height difference of railway line steel rail top surfaces, which can accurately and intuitively detect relative height difference of steel rail top surfaces and bring convenience to the field laying of the rails. A vertical bracket is vertically fixed on a base; a horizontal guide rod is horizontally fixed at the upper part of the vertical bracket by a tightening bolt; a digital display device is positioned on the horizontal guide rod; and a detecting contact and the digital display device are in sliding fit with each other and the detecting contact vertically slides along the digital display device. The digital display detecting device and detecting method, provided by the invention, has the following advantages that: first, a detecting point locating reference plane is selected and a digital display device locating and resetting method is adopted for measuring the data; second, the accuracy in measuring the data is assured, the data accuracy can reach 0.01 mm, and the convenience in reading the data is also obtained.