The invention provides a gas-shield welding wire with fire resistance, weather resistance, and good low-temperature impact toughness and welding process performance. The welding wire comprises the following chemical components of, in percentage by weight, 0.04%-0.09% of C, 0.25%-0.50% of Si, 1.20%-1.60% of Mn, less than or equal to 0.012% of P, less than or equal to 0.005% of S, 0.30%-0.60% of Mo,0.10%-0.50% of Cr, 0.60%-1.00% of Ni, 0.10%-0.40% of Cu, 0.05%-0.15% of Ti, 0.015%-0.05% of Re and the balance Fe and inevitable impurities. According to deposited metal of the welding wire, the normal-temperature tensile strength Rm is larger than or equal to 570 MPa, the yield strength Rp<0.2> is larger than or equal to 460 MPa, the elongation A is larger than or equal to 18%, and the -40 DEG Clow-temperature impact energy KV<2> is larger than or equal to 47 J; the yield strength of the deposited metal, kept for 1 hour-3 hours at 600 DEG C, of the welding wire is not lower than 2/3 of theminimum yield strength specified at normal temperature; the atmospheric corrosion resistance index I calculated according to chemical components is greater than or equal to 6.0; and the welding wire is reasonable in component design, easy and convenient to manufacture and suitable for gas shielded welding of anti-seismic fire-resistant corrosion-resistant steel plates with the yield strength being460 MPa.