A method and device for automatically marking an article are provided, by which the deterioration in the yield can be prevented from occurring and a color of a mark to be formed on the article can be easily changed. A device 1 for automatically marking an electric wire as a device for automatically marking an article marks an outer surface 3a of an electric wire 3. The device 1 includes first and second spouting means 311, 321, encoder 33 and control device 34. The first spouting means 311 spouts a specific amount of a first coloring agent toward the outer surface 3a of the electric wire 3. The second spouting means 312 spouts a specific amount of a second coloring agent toward the outer surface 3a of the electric wire 3. The encoder 33 detects a transfer speed of the electric wire 2 which is transferred in a direction of arrow K. The control device 34 makes the first and second spouting means 311, 312 spout the coloring agent according to a pattern predetermined in advance in response to the transfer speed of the wire 3 detected by the encoder 33.