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The amplitude of the electromotive force signal generated by the coil magnetic sensor varies greatly with the change of measuring speed. In order to realize the distortion-free acquisition of such amplitude and periodic dynamic change signals, an adaptive gain acquisition system with the gain changing with the amplitude level of the input signal is designed. The system takes field programmable gate array (FPGA) as the control core, analyzes the amplitude of the input signal, and adaptively changes the gain of the control circuit in the range of -20dB~80dB according to the amplitude analysis result, records the current gain of the system, restores the input signal according to the current gain, and synchronously stores the gain signal and the restore signal. After adaptive gain, the amplitude of the output signal is controlled within the set range, which is conducive to the direct observation of the details of signal changes in different amplitude ranges of dynamic signals. Through the speed signal input test in the range of 20μV~10V, the signal amplitude of the system after adaptive gain is controlled in the range of 0.1V~4V, and the dynamic speed signal is acquired without distortion, and the performance of the adaptive gain acquisition circuit is verified. It has a good application prospect in the field of dynamic signal acquisition with high amplitude.