The invention discloses an environmentally-friendly welding robot for constructing a municipal road. The environmentally-friendly welding robot comprises a rack on which four walking mechanisms are arranged, wherein the four walking mechanisms are correspondingly arranged at the front and back of two sides of the rack, and each walking mechanism comprises a hollow shaft and a solid shaft; each hollow shaft sleeves an outer circle of the corresponding solid shaft; the hollow shafts are connected with the solid shafts through bearings; the outer circles of the hollow shafts are connected to a side arm of the rack through the bearings; a first supporting arm is fixedly connected to a part, positioned at the outside of the rack, of an outer circle of each hollow shaft; two ends of the solid shafts are longer than the hollow shafts; a second supporting arm is arranged at a part, positioned at the outside of the rack, of the outer circle of each solid shaft; the first supporting arms and the second supporting arms are correspondingly positioned at two sides of axes of the hollow shafts. According to the environmentally-friendly welding robot for constructing the municipal road, the four walking mechanisms are arranged to realize the walking of the robot; in addition, a complex terrain applies; each walking mechanism can be independently adjusted and matched with other walking mechanisms; a plurality of walking modes are provided; the height of the rack can be increased and decreased by adjusting the corresponding walking mechanisms.