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A special hot-dip alloy for the surface coating of titanium alloy part comprises (mass%) : silicon 8-24%, zinc 1.2-3.1%, rare earth element 0.02-0.5%, magnesium 0.5-3.2%, iron 0.05-1%, copper 0.05-0.5%, manganese 1.0-2.0%, chromium 0.5-2.0%, zirconium 0.02-0.5%, nano oxide particle reinforcing agent consists Of TiO2 and/or CeO2 1-2%, and remainder containing aluminum and inevitable impurities. Also provided is a method for preparing the hot-dip alloy.