Abstract: A novel digital portable optical experimental instrument is introduced, which can be used for optical experiment，demonstration in class，research and test. It can fulfil interference, diffraction and holography in wave optics, as well as imaging in geometic optics. The instrument is designed with an orbit in “又” form and a bracket in “工” form to realize a smooth and accurate adjustment. An image processing software and a multilayer instrument which connects the PC mother board with an optical bench were developed base on RGB average method. The image can be gathered and processed in real time. Compared to the traditional experiment set up, this instrument could expand the scope of the digital optical experiment significantly.