The invention discloses a swing type
electric arc additive manufacturing printing device which comprises a printing frame, a printing mechanism and a
metal additive, and an
electric arc pen is installed on one side of the printing mechanism in an embedded mode. When the thickness of the mold table changes, the expansion contact is correspondingly pushed, when the thickness of one side of the mold table is large, the expansion contact on the side is pushed out, the fixed supporting rod serves as a fulcrum, the contact rod on the transmission rod moves towards the interior of the printing mechanism, the contact on the contact rod slides along with the contact and is attached to the driving rotating wheel on the other side, and a current path is formed. The corresponding driving rotating wheels are driven to rotate, the
metal additive is driven to move downwards, feeding adjustment of areas with different thicknesses is achieved, the driving gear shaft rotates by the corresponding length through the moving distance of the transmission rod, then the sliding distance of the closing plate in the heating head is controlled, and the discharging coverage amount corresponding to the thickness is adjusted. And the supply amount and the
discharge amount of the
metal additive are correspondingly adjusted according to the thickness change of the mold.