The invention discloses a fracture plate metal inert-gas (MIG) arc welding additive remanufacturing method. The fracture plate MIG arc welding additive remanufacturing method comprises the first stepof measuring the geometrical defect size of a component/part, specifically, the defect size of the fracture part is measured, and the three-dimensional defect size of the fracture part is obtained; the second step of total planning of piling, specifically, by combining the three-dimensional defect size of the fracture part, according to piling heights and widths under different welding piling rates, the number of single-layer weld passes and the number of layers are determined; the third step of optimizing a single pass welding process, specifically, the welding piling rate at the arc startingposition is reduced, and the welding piling rate and welding gun inverse motion at the arc quenching position are improved; the fourth step of optimizing an interlayer path, specifically, the pilingpaths of every two adjacent layers are opposite in moving direction; and the fifth step of cooling, specifically, in the whole welding process, water cooling and/or air cooling are/is carried out on the fracture piece in real time. By means of the method, rapid recovery of the geometric size of size damage of the fracture is achieved, the heat accumulation effect is reduced, the remanufacturing size precision and service performance are improved, the repairing difficulty is lowered, and maneuverability is high.