A supercontinuum spectrum source with all-fiber structure is proposed to obtain high power supercontinuum spectrum with the pulse width of 12 ps and the center wavelength of 1064 nm. The source is used as the pump source, and the output power is amplified to 189 W in a Yb-doped fiber with a length of 10 mm. A narrow-band filter and a interstage isolator are used to amplify the pulse signal. The amplified pulse signal is injected into a photonic crystal fiber with a length of 0.5 m, and supercontinuum spectrum is generated with the spectrum range of 460-1700 nm and the output power of 102.8 W. For the existence of quantum defect and spectrum transmission loss, the light-light slope efficiency of the supercontinuum spectrum decreases from 90% to 30% when the pump power increases from 1.5 W to 189 W.