We reported a high-power ultra-narrow fiber-coupled diode laser using a Faraday anomalous dispersion optical filter (FADOF) as an external cavity element. An external cavity suitable for both the fiber-coupled package and FADOF configuration has been proposed. Using a 87Rb-based FADOF as the frequency-selective element, we realized a 103 W continuous laser output with a uniform circular beam. The center wavelength was precisely locked at the D2 line of the Rb resonance, and the bandwidth was narrowed from 1.8 nm (free running, FWHM) to 0.013 nm (6.9 GHz, FWHM). The side mode suppression ratio (SMSR) reached 31dB. Such kind of diode lasers with precise wavelength and high spectral brightness have important applications in many fields, such as high-energy gas laser pumping, spin-exchange optical pumping (SEOP), Raman spectroscopy, nonlinear optics, etc.