Abstract: An all-fiber supercontinuum generation system is built based on a long tapered photonic crystal fiber with small core diameter, large duty cycle and gragual core change. The system uses high power picoseconds seed source pumping to achieve 314.7 W high power supercontinuum output covering all visible light with spectrum coverage 388−2400 nm. It takes into account high power and blue shift enhancement in the shortwave direction at the same time, and it has the highest power of supercontinuum covering full visible spectrum publicly reported at home and abroad.