Power supply unit of electric power information network twine equipment relates to electric power information network twine equipment power supply technical field, and for the node equipment that assembles of solving the electric power information network twine directly adopts the alternating current 220V power supply, alternating?current?power?supply suspends influencing the problem of equipment normal operating. The incessant communication power supply system of 48V is power supply unit, main, reserve switched systems is used for to main with alternating current and reserve alternating current automatic switch -over, and the alternating current is mainly used in preferred output, still is used for to main with direct current and reserve direct current automatic switch -over, and the direct current is mainly used in preferred output, and alternating current -direct current switched systems is used for the alterating and direct current automatic switch -over, and preferred alternating current is information network equipment and supplies power. The utility model discloses the service reliability who makes the network equipment is protected, saves the overlapping investment of power supply unit, and simple structure does benefit to popularization and application, is applicable to to supply power to electric power information network twine equipment.