Abstract: Aiming at the low detection accuracy of pantograph slider wear for urban rail trains, this paper proposed a method of pantograph slider wear detection of urban rail trains based on the laser displacement sensor. The paper designed a wear detection device for the pantograph slider. By using this detection device, the paper obtained the actual wear contour of the pantograph slider by data filtering, data fusion and slider correction, matched the actual contour line with the standard contour line of the pantograph slider to obtain the wear curve of the pantograph slider plate, and achieved the detection of the wear status of the pantograph slider. By establishing a wear detection device for the pantograph slider in the laboratory for experiments, the experimental results show that the proposed method has good detection accuracy of pantograph slider wear compared with the traditional detection methods, and can meet the practical requirements for urban rail trains.