The invention provides a digital real-time simulation physical port device of a power system based on optical fiber communication. The port device comprises a machine case, a bottom plate, a power plate, a functional plate and a liquid crystal screen, wherein the bottom plate, the power plate, the functional plate and the liquid crystal screen are located in the machine case. The bottom plate is vertical to an upper panel and a lower panel of the machine case, the power plate and the functional plate are respectively fixed through insertion grooves formed in the upper panel of the machine case, the lower panel of the machine case and the bottom plate, and the liquid crystal screen is installed on a front panel of the machine case and is connected with the bottom plate through a PCI bus. The digital real-time simulation physical port device of the power system based on optical fiber communication has the advantages of being large in port scale, high in sampling accuracy, high in data processing speed, high in synchronization precision and the like, and can meet new test requirements.