The invention discloses a portable multi-purpose metalworking machine. The upper surface of a welding power box body is fixedly connected with a supporting plate; one end of the upper surface of the supporting plate is articulated with a rotating body; the two ends of a resetting torsion spring are respectively connected with the supporting plate and the rotating body; the rotating body is articulated with one end of an assembling plate; the other end of the assembling plate is fixedly connected with a handle; the other end of the upper surface of the supporting plate is fixedly connected with an open plate which is connected with the handle in a clamping manner; the rotating body is movably connected with locating pins; the assembling plate is provided with a plurality of clamping holes which can be connected with the locating pins in a clamping manner; a locking rod is movably connected with the open plate; the tail end of the locking rod is fixedly connected with a slider which can be connected with the supporting plate in a sliding manner; the slider is fixedly connected with a movable plate; the upper surface of the supporting plate is fixedly connected with a fixing plate; the assembling plate is detachably connected with a handheld power component. The portable multi-purpose metalworking machine disclosed by the invention has the beneficial effects of being novel in structure, multi-purpose by one machine, compact in structure, capable of saving space, and convenient to carry.