The invention relates to a preparation method of the composite cathode of solid oxide-fuel cell, pertaining to the fuel-cell material field of solid oxide of chemical electric power source. The preparation method comprises the steps: 1) preparing cathode material AuNi by a method of co-reduction heat treatment, 2) preparing the cathode material Bi2V0.9Cu0.1O5.35, 3) preparing composite cathode. The material prepared by the preparation method of the composite cathode of the solid oxide-fuel cell of the invention has the most prominent advantages of high purity, high electronic conductivity rateof the overall material, high catalytic efficiency at the application range of the temperature of 450-600 DEG C and stable power output, the high output voltage for the solid oxide-fuel of the cathode, high power density, stable output and good safety. The open-circuit voltage of a best sample is as high as 0.9V with the power of 369mW/cm<2>.