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In order to accurately detect the characteristic parameter values ??of the track frequency shift signal and realize the real-time and stable transmission of train communication data, a railway frequency shift signal detection system based on Zoom-FFT technology is designed. Using the AD conversion circuit as the core electronic output device, with the aid of the DSP frequency shift chip and the signal sensing unit for the adjustment of the train communication data, an instantaneous railway frequency shift signal display file is generated in the LCD screen, and then the micro-processing receiving element is combined. To achieve accurate acquisition of signal characteristic parameters, complete the hardware structure design of the detection system. On this basis, according to the instantaneous output frequency of the signal data, the standard modal frequency shift function is determined, and the frequency analysis of the railway frequency shift signal based on the Zoom-FFT technology is completed. Set three types of procedural algorithms: data acquisition, frequency shift filtering, and WIFI communication, establish the physical connection between the signal database and the core detection host, realize the establishment of the system detection software and application main program, and combine all the above software and hardware execution structures to complete the Zoom-based -Design of FFT technology railway frequency shift signal detection system. The comparison experiment results show that after applying the new detection system, the detection accuracy of low-frequency and high-frequency track frequency-shifted signals has been significantly improved, which solves the problem of poor stability of real-time transmission of train communication data supported by the original detection system.