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For the problem of low efficiency of digital signal detection in the background of Levy noise, a new method based on adaptive cascaded tristable stochastic resonance is proposed in contrast with the traditional modem model of 4FSK signal. The output signal bit error rate (BER) of the adaptive cascaded tristable stochastic resonance system model and conventional models is simulated and compared. Numerical simulation experimental results show that compared with the traditional model, the output BER of the 4FSK signal after demodulation of the adaptive cascaded tristable stochastic resonance system model is reduced by 4% on average compared with the traditional modem model. The time domain image is clearer, the burrs are significantly reduced and the spectral amplitude is greatly improved. The success of this experiment shows that the stochastic resonance system has great prospects in digital signal detection in impact environment.