The invention discloses a portable multifunctional laser welding machine. The machine comprises movable wheels capable of being fixed, a movable base, a foldable supporting rod, a protective plate structure, a welding machine column, a hoop piece, a sliding block, a welding machine body, a sliding rail, a transverse column, a longitudinal rod, a chip blowing fan structure, a rotating seat with a bearing, a stand column, a computer, an L-shaped lining plate, a writing plate structure and locking pins. According to the laser welding machine, the movable base, the foldable supporting rod and thestand column are fastened and connected through the locking pins, so that dismounting and mounting are convenient, meanwhile, the folding function is realized, and the convenient-to-carry function isrealize; and a rotating plate, a dust-proof hemispheric plastic cover, a mounting base and a welding table are arranged, so that the dust-proof work can be carried out through the dust-proof hemispheric plastic cover, meanwhile, the covering position of the dust-proof hemispheric plastic cover can be conveniently adjusted, the operation is convenient, and the dust-proof function of the laser welding machine is improved.