WO3-x@Au@MnO2 core- shell nano wires (NWs) are synthesized on a flexible carbon fabric and show outstanding electrochemical performance in supercapacitors such as high specific capacitance, good cyclic stability, high energy density, and high power density. These results suggest that the WO3-x@Au@MnO2 NWs have promising potential for use in high-performance flexible supercapacitors.