The invention provides a power system dynamic simulation experiment platform device. The power system dynamic simulation experiment platform device comprises a valve-based controller, unit simulation and control modules, a digital simulator interface module, a host computer and a real-time digital simulator; the valve-based controller is connected with the unit simulation and control modules, the digital simulator interface module and the real-time digital simulator in turn through a high-speed optical fiber; and the digital simulator interface module is connected with the host computer through an Ethernet. According to the power system dynamic simulation experiment platform device adopted, a plurality of unit simulation and control modules are combined to build the simulation valve tower structure of a power unit so as to simulate the electronic and mechanical features of the unit control board of the power unit and the power unit itself. With the power system dynamic simulation experiment platform device adopted, not only can a conventional power system dynamic simulation experiment be realized, but also the various characteristics of the power unit itself can be also simulated; and various faults of the power unit itself can be simulated; and therefore, deficiencies in responding to and testing unit-level faults in the existing system of an dynamic simulation experiment platform can be eliminated.