A wire harness manufacturing system includes a display unit, a wire cutting machine that draws an electric wire from a wire feed reel and cuts the electric wire to a predetermined length, a control unit that directs the display unit to display a wire laying image and wire work identification information for identifying a work regarding each electric wire, the wire laying image including a plurality of wire images showing the plurality of electric wire in the laid state and the wire work identification information being displayed in the vicinity of the corresponding wire image, and a memory unit that stores the wire laying image and work instruction information so as to correspond to the wire work identification information, the work instruction information including cut length of the electric wire. The control unit sends the cut length information to the wire cutting machine.