A high-speed synchronous data acquisition and digital signal processing board used in electric power system is composed of analog signal input and A/D converter module (including low-pass circuit, band-pass circuit, A/D module and hardware starter), digital signal processing module (inlcuding control and encode circuit, DSP module, buffer, dual-port RAM, FLASH memory for program, data RAM and digital signal processing program), and communication module. It can quickly and synchronously acquire voltage and current signals and processing them in real-time mode.