The invention relates to the field of metal wire machining devices, in particular to a device for removing an oxide layer from a metal wire. The device comprises a base, a feeding structure, an adjusting structure, a lubricating structure, a power structure, a guide structure, a discharging structure and a grinding structure; the interior of the base is rotatably connected with a rotating shaft provided with the hollow interior and being of a cylinder structure through two bearings, abrasive paper of a cylinder structure is fixedly arranged in the rotating shaft, the rotating shaft is driven through the power structure fixed to the top end of the base, through the power structure and the abrasive paper in the rotating shaft, the automatic rotary grinding of the metal wire can be achieved,the outer portion of the metal wire can be subjected to comprehensive grinding treatment, the oxide layer, passing through the abrasive paper, of the outer portion of the metal wire can be completelyremoved, the lubricating structure is fixed to one end of the base, due to the lubricating structure, before the metal wire enters between parts of the grinding structure, the metal wire can be sufficiently lubricated, the outer portion of the metal wire entering the grinding structure is stained with the lubricating oil, and the grinding effect of the metal wire is better.