The invention discloses a gas-shielded welding wire used for the production of grade X80 steel and oil and gas transferring. The gas-shielded welding wire comprises the following chemical compositions (according to the weight percentage): 0.08-0.12 percent of C, 1.40-2.0 percent of Mn, 0.30-0.70 percent of Si, larger than 0 and smaller than or equal to 0.015 percent of P, larger than 0 and smaller than or equal to 0.015 percent of S, 0.20-0.40 percent of Mo, 0.10-0.35 percent of Cu, 0.10-0.2 percent of Ti, 0.15-0.40 percent of Cr, 0.65-0.90 percent of Ni, 0.004-0.008 percent of B, 94.9-97.0 percent of Fe, and impurity for the residual; the gas-shielded welding wire is produced according to the production technique of common gas-shielded welding wire. The pipe used for production has the following welding seam performances: the tensile strength is 665-750MPa, the yield strength is 555-680MPa, the specific elongation is 20-29 percent, the hardness is 205-236HV10, the Charpy Impact energy is Akv(-10 DEG C)=230-262J, and the shearing area is 66-73; the Charpy Impact energy of the heat affected zone is Akv(-10 DEG C)=224-268J, the shearing area is 75-83, the performances are greatly superior to the requirements on the welding seam performance of the grade X80 steel pipe, the gas-shielded welding wire has excellent performances such as high strength, high toughness, good corrosion resistance, low hardness and the like which are similar to the performances of the pipe body, the security of pipe transportation can be effectively enhanced, and the service life of the pipe transportation can be prolonged.