A wire structure for a power supply. It includes a power supply having a casing on which a wire structure is transfixed out for outputting the power source. The wire structure is composed of a cluster of connection wires, a motherboard power cord, and at least one power cord set. The cluster of connection wires is provided with a plurality of connection seats for connecting with the power cord set, and the other end of the power cord set is provided with a power connector corresponding to future expanded equipments and elements for various different specifications.