To address the issue of drift and the high cost of calibration in the F-P filtering demodulation method, this paper had developed a F-P filter multi-channel resonance demodulation system using the FPGA and the fiber optic switch. The system utilizes DDS signals to generate specific triangular wave driving voltages and achieves dynamic calibration of wavelength-time by linking multiple-dimensional reference FBGs in series. Three dynamic calibration modes, including linear and quadratic relationships, are set. The FPGA-controlled fiber optic switch enables fast channel switching of modes and step-by-step acquisition of reference wavelength and wavelength signal to be measured. he average deviations in the three modes are 0.028 02 nm, 0.018 14 nm, and 0.010 9 nm, respectively, at a frequency of 100 Hz. The research results indicate that, under a unit voltage of 1 V, the deviation is reduced by over 45% compared to static calibration, improving the demodulation accuracy Improves demodulation accuracy, reduces calibration costs and addressing the issue of misjudgment caused by the proximity of the reference and measured wavelengths.