The invention discloses a bright welding wire for heat-resistant steel for an ultra-supercritical coal-fired power station and belongs to the technical field of welding materials. The welding wire comprises, by weight, 0.10-0.15% of C, 8.5-9.0% of Cr, 0.1-0.6% of Ni, 0.3-0.6% of Mn, 2.5-3.0% of Co, 2.0-2.7% of W, 0.020-0.035% of Nb, 0.001-0.010% of Zr, less than or equal to 0.006% of N, 0.16-0.20%of V, 0.003-0.010% of B, less than or equal to 0.20% of Si, less than or equal to 0.006% of P, less than or equal to 0.006% of S, less than or equal to 0.010% of O, less than or equal to 0.03% of Al,less than or equal to 0.01% of Ti and the balance Fe and inevitable impurity elements. The bright welding wire has the advantages that the welding wire has good welding process performance and excellent deposited metal flowability and formability, and the deposited metal after welding has excellent mechanical properties and good room temperature impact toughness.