Aiming at the difficulties in monitoring the galloping period of optical power grounded waveguide in the external field environment, a low-noise galloping monitoring array based on the input of reference sensor for weak fiber Bragg grating was proposed. The signal models for reference sensor and monitoring sensor were analyzed, and then the signal processing steps of adaptive filter through theoretical model were derived. Besides, by changing noise input with different correlation coefficients, the corresponding simulation results were calculated, so that the noise reduction effect of the monitoring sensor was compared and analyzed. Finally, the low-noise distributed galloping monitoring system based on weak fiber Bragg grating was deployed in a western autonomous prefecture with 220 kV power transmission line. The results of the field experiment show that, after self-adaptive filtering for the input signal constructed by the reference sensor, the average noise power spectral density is reduced by 6.34 dB within 100 Hz bandwidth, the monitoring intensity spectrum is optimized by the algorithm, and the galloping period events of about 100 m can be obviously observed within the monitoring interval. The research results create certain conditions for further improving the typical event classification data processing and pattern recognition database, and prove the effective prospects in engineering application.