The invention relates to hot-dip cast aluminum 
alloy for anticorrosion treatment on 
engineering parts resistant to marine climate and a preparation method thereof, wherein said cast aluminum 
alloy contains Al, Zn, Si, Mg, RE, Ti, Ni and nanometer 
oxide particle reinforcing agent, said nanometer 
oxide particle reinforcing agent is selected from one or two of TiO2 and CeO2, the 
mass percentage of the components is as follows: Zn: 35-58%, Si: 0.3-4.0%, Mg: 0.1-5.0%, RE: 0.02-1.0%, Ti: 0.01-0.5%, Ni: 0.1-3.0%, and the total content of the nanometer 
oxide particle reinforcing agent: 0.01-1.0%; and the balance consists of Al and unavoidable impurities. The 
coating using cast aluminum 
alloy prepared by the invention has sufficient 
corrosion resistance and scour resistance in marine climate