Portable welding machine

The utility model belongs to the technical field of welding machines, and particularly relates to a portable welding machine which comprises a bottom plate, first supporting legs are fixedly connected to the positions, close to the four corners, of the lower surface of the bottom plate, fixing plates are symmetrically fixed to the upper surface of the bottom plate, and a containing plate is installed between the two fixing plates in a sliding mode. By arranging the two fixing assemblies, the defect that the fixing position of a transmission positioning limiting assembly cannot be changed is overcome, welding machine main bodies of different specifications can be effectively fixed through the device, the applicability is greatly improved, and by arranging the driving assembly, a bidirectional threaded rod, a threaded block, a connecting rod, a second supporting leg, universal wheels and the like, the welding machine main bodies can be conveniently fixed. The four second supporting legs can be freely folded or