Mobile protection box of electric welding machine

The invention discloses a mobile protection box of an electric welding machine. The mobile protection box of the electric welding machine includes a box body, wherein the electric welding machine is arranged in the box body, and a plurality of screw bars are vertically connected with the inner wall of the box body. A nut is arranged on the upper screw of the screw rod, and one end, far away from the side wall of the box body, of the nut is connected with a connecting rod to abut against the outer wall of the electric welding machine. The nut is a butterfly nut, and the two butterfly wings of the butterfly nut are arranged toward the direction of the electric welding machine. The connecting rod is parallel to the screw rod, and the length of the connecting rod is not less than the length ofthe screw rod. The safety protection, movement and warning performance of the electric welding machine is improved; the service life of the electric welding machine is improved; a two-time unloaded step-down protector is add