The invention provides a 900MPa-level high-performance gas shielded welding wire, which is suitable for welding large-sized important structural members in the heavy load fields of engineering machinery, coal mine machinery, railroad bridges, automobile cranes, high pressure vessels and the like. The gas metal arc welding welding wire comprises the following chemical components in percentage by mass: 0.05 to 0.10 percent of C, 0.40 to 0.80 percent of Si, 1.60 to 2.00 percent of Mn, 2.0 to 2.6 percent of Ni, 0.3 to 0.7 percent of Mo, 0.20 to 0.60 percent of Cr, 0.02 to 0.08 percent of Ti, 0.002 to 0.006 percent of B, 0.02 to 0.08 percent of Zr, less than or equal to 0.010 percent of S, less than or equal to 0.010 percent of P, less than or equal to 0.003 percent of O, less than or equal to 0.007 percent of N, and the balance of Fe and inevitable impurities. The welding wire adopts Ar+20 percent CO2 gas shielded welding rich in argon, can be used for welding high-strength low ally steel of which the tensile strength Rm is more than or equal to 900MPa, and a weld metal has high obdurability and cracking resistance under a welding condition and a post-welding hardening and tempering condition.