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Abstrct Aiming at the shortcomings of the current mechanical track wave measurement.There are many disadvantages such as limited conditions of use, A laser automatic detecting rail wave grinding device is developed. This device mainly uses the non-contact laser sensor to detect, uses the step motor to drive the sensor to scan the rail surface, and transmits the data to the upper computer by the single-chip microcomputer combined with WiFi. The PC program written by C # is used to collect and analyze the data. After many field tests, the equipment can collect rail wave grinding data stably and accurately, and it has the characteristics of fast acquisition speed, convenient equipment movement, high detection efficiency of rail wave mill and so on.