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The service life of subways is related to the wear and tear of subway tracks. Timely detection and repair of track problems can effectively improve the service life of subways. In order to improve the service life of urban subways, a subway track wave wear and tear detection system based on the inertial reference method has been studied and constructed. The system takes the inertial reference method as the core, cooperates with accelerometers, and detects vehicles, Detect the wear and tear of subway tracks. The results show that the detection cost of the detection system based on the inertial reference method is 65324 yuan, and the detection cost of the detection system based on the string measurement method is 78681 yuan. The detection results of the detection system based on the inertial reference method are basically consistent with the actual situation. The detection cost of the subway track wear and tear detection system constructed through research is lower, and the detection accuracy meets practical application requirements.