An illumination device for a notebook computer comprises a base, a support arm, and a light body. The base is flat with the front end having a size corresponding to a PCMCIA interface slot in the notebook computer. An electricity fetching plug connector is provided at the front end with an electric wire extended in the base. The plug connector is corresponding to a power source terminal in the PCMCIA interface slot of the notebook computer. The support arm has an end thereof provides a pivot joint attached to the upper side of the base for being able to performing angular movement upward and downward. The other end of the support arm provides a support joint. The light body has a lamp shield connecting with the support joint and at least an illuminator is disposed under the lamp shield. The illuminator provides an electric wire to connect with the preceding electric wire in the base.