Drawing device and drawing method

The invention relates to a drawing method and a drawing device. The drawing device comprises a substrate, a mechanical arm and a processing assembly, wherein a working platform is arranged on the substrate, and the working platform is used for fixing a metal workpiece; the mechanical arm comprises a base and a first connecting rod, the base is fixed to the substrate, and one end of the first connecting rod is rotatably connected to the base; the processing assembly comprises a drawing wheel and a working rotating shaft, the working rotating shaft is rotatably connected to one end, which is far from the base, of the first connecting rod, and the drawing wheel is rotatably connected to the working rotating shaft; when the working rotating shaft is driven to beaxially in the vertical direction by the first connecting rod, the side wall of the metal workpiece is drawn by the drawing wheel; when the working rotating shaft is driven to be axially in the horizontal direction by the first connecting rod, the top surf