An output structure for a redundant power system includes at least two power supplies, a first circuit board and a second circuit board. The power supplies and the first circuit board have respectively a first connection port and a second connection port that correspond and connect to each other. The second connection ports are electrically connected to at least one conductive element to conduct output of the power supplies. The conductive element has another end transporting power to the second circuit board. The second circuit board has at least one transformation circuit to regulate the power passing through the conductive element to form at least one output power to a load. Through the first and second circuit boards, the power of multiple power supplies can be clustered and transformed and delivered. Heat dissipation improves and the size can be shrunk, and insulation density between circuit elements can be maintained.