To generate a broader spectrum， higher power， and a more streamlined white light supercontinuum output， this research investigates the application of self Q-switching technology in producing high-power white light supercontinuum through stimulated Brillouin scattering （SBS） and Rayleigh scattering （RS） mechanisms in optical fibers. The experimental setup employed a semi-open cavity structure comprising ytterbium-doped fiber， photonic crystal fiber， and high-reflectivity grating. Without external pulse modulation， the study successfully achieved a high-power white light supercontinuum spectrum spanning 410-1 700 nm， with an output power of 24 W and a repetition frequency of 188.7 kHz at a pump power of 97.4 W. The light-to-light conversion efficiency reached 24.6%. These findings demonstrate that the white light supercontinuum fiber laser based on the SBS self Q-switching mechanism represents a novel light source with significant advantages， including a simplified structure， extensive spectral range， and superior spectral uniformity. The research provides an innovative design approach for developing high-power white light supercontinuum spectral light sources.