The utility model discloses a digital interface IO board of intelligent substation, including the box, one side of box is provided with a plurality of IO and gathers the board, and a plurality of IO gather the board and arrange the setting, IO collection board still carries and is used for carrying out the small -size treater of preliminary treatment and the button cell who is used for providing the power to information, and the bottom that IO gathered the board is provided with the information interaction module who is used for carrying on data transmission and power supply with the mainboard. The utility model discloses a design at a structural adoption activity integrated circuit board of box disposes IO acquisition board card according to on -the -spot actual need is nimble, adopts giga rank optical network card in addition, can realize the quick interactive processing of information between external data and the system. The button cell who sets up small -size treater and be used for providing the power on the IO integrated circuit board to make the IO board simply handle information, alleviateed CPU's burden. The IO board prop root of device disposes according to on -the -spot actual conditions are nimble simultaneously, saves the cost.