A distributed fiber grating signal demodulation technology based on Labview is proposed due to poor channel balance caused by inter symbol interference in communication channels in distributed fiber grating signal demodulation. The continuous time sampling technology is used to build a distributed fiber grating signal acquisition model, and the power spectral density characteristics of the signal output are phase modulated. The offset center frequency and single sideband power spectral density characteristics of the distributed fiber grating signal are extracted under the discrete Wiener model, and the signal is modulated and demodulated through the modulation and demodulation technology of Labview, Finally, the constellation analysis method of resisting phase noise interference is used to analyze the anti-interference and error suppression capabilities of fiber grating signal demodulation. The simulation results show that this method has good anti-interference performance for distributed fiber Bragg grating signal demodulation, improves the spectral bandwidth of the channel, reduces frequency center offset, has a low transmission error rate of 0.05%, and maintains a signal transmission delay of 30 μs, with strong applicability.