The invention discloses a general platform for power system automation devices, comprising a central processing plug-in, a peripheral plug-in, and a switching input/output plug-in. The central processing plug-in comprises a DSP, a CPLD, a communication circuit, an SPI interface circuit, a dual-port memory, a single-port memory, a watchdog circuit, a ferroelectric memory and a real-time clock, wherein the CPLD, the communication circuit, the SPI interface circuit, the dual-port memory, the single-port memory, the watchdog circuit, the ferroelectric memory and the real-time clock all communicate with the DSP in a two-way mode, and the CPLD and the switching input/output plug-in communicate in a two-way mode. According to the invention, as the hardware is designed into a plug-in type general platform, a stable hardware development platform can be provided for development, there is no need to design separate hardware for different devices, various different power system automation devices based on the platform can be developed quickly on the basis of the hardware platform, the product development cycle is shortened, the quality of development is improved, and the development cost is reduced.