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We report on a compact, stable, all-fiberized narrow-linewidth（0.045 nm） pulsed laser source emitting laser beam with a wavelength of 266 nm, and tunable pulse width and repetition rate. The system is based on all-fiberized nanosecond amplifier architecture, which consists of Yb-doped fiber preamplifiers and a super-large-mode-area Yb-doped fiber power amplifier. The fiber amplifier with a core of 50 μm is used to raise the threshold of the stimulated Brillouin scattering（SBS） effect and to obtain high output power and single pulse energy. Using lithium triborate（LBO） crystal and betabarium borate（BBO） crystal for realizing the second-harmonic generation（SHG） and fourth-harmonic generation（FHG）,we achieve 17 μJ（1.73 W） and 0.66 μJ（66 mW）, respectively, at wavelengths of 532 nm and 266 nm and a repetition rate of 100 kHz with pulse width of 4 ns. This source has great potential applications in fluorescence research and solar-blind ultraviolet optical communication.