Preparation for load type gold catalyst by bacterial reduction method

The present invention relates to a method for preparing load type metal catalyst. Said invention is characterized by that it adopts isochoric impregnating method to make Au3+ in chlorauric acid solution load on surface of metal oxide MxOy to obtain catalyst precursor Au3+/MxOy, in which the weight ratio of Au3+ and MxOy is 1%-3%, then the bacterial suspension containing D01 and Au3+/MxOy are reacted for 0.5-2hr., reaction temp. is 15-50 deg.C, pH value is 2.0-5.0 to obtain Au0/MxOy catalyst. Said invention utilizes the bacteria to in-situ reduce Au3+ into high-dispersed metal nanometer particles, and the Au3+ reducibility on the carrier surface is up to 85%-100%,Au0 particle diameter is 4.5-12 nm. Said catalyst can be used in CO catalytic conversion reaction, CO conversion rate is 100%, and its stationary phase is up to 75h.