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The railway track, as the transmission carrier of frequency shift signals, its ability to distinguish the density of signal object transmission trajectories determines the accuracy of the track system in measuring frequency shift signals. To achieve accurate identification of the transmission frequency of signal objects, a railway track frequency shift signal measurement system based on Duffing oscillator is designed. Distribute the power signal output by the power module to the STM32F103 microprocessor, frequency shift signal identification module, and DSP measurement unit as needed, improve the connection relationship between various application components, and achieve the hardware design of the railway track frequency shift signal measurement system. Determine the Duffing oscillator description condition of the frequency shift signal, construct the phase space of the frequency shift signal according to its definition form, and complete the extraction of the railway track frequency shift signal. Solve the Lyapunov exponent of railway tracks, construct the Duffing equation for frequency shift signals, determine the range of chaotic measurement parameters, achieve the measurement of railway track frequency shift signals, and combine various application components to complete the design of a railway track frequency shift signal measurement system based on Duffing oscillators. The experimental results show that the signal transmission track density measured by the above system has a high similarity with the real track density, and can achieve accurate measurement of Railway track frequency shift signals.