High power laser output can be obtained by a power beam combiner. The supercontinuum laser is chosen as the input light source to obtain a broadband. So the broadband power combiner with the combination of the both is a hotspot. The 3×1 broadband power beam combiner based on the incoherent power combination of supercontinuum sources is simulated and analyzed. The various of the transmission efficiency and the beam quality of different combined wavelengths are compared and analyzed. By comparing and analyzing the simulation results of different wavelengths, the combined effect of the 3×1 broadband power combiner on the broadband light source is evaluated. And it can provide references for fabrication and use of the boradband power combiner.