The invention discloses a cored wire for preparing an Al-Ni-Zr-Cr amorphous coating by utilizing a high velocity arc spraying technology. The cored wire is characterized in that the skin of the cored wire is a pure aluminum belt, wherein the mass percentage of a core accounting for the wire is 32 to 40 percent; the core is prepared from the following components in percentage by mass: 16 to 24 percent of Ni, 8 to 14 percent of Zr and 0 to 8 percent of Cr. The preparation method comprises the following steps: firstly, rolling the pure aluminum belt into a U shape; secondly, weighing accessories according to the mass percentage of all the components of the core, and putting the weighed powder into a powder mixing machine for mixing; thirdly, adding uniformly-mixed powder into a U-shaped aluminum belt groove according to a powder adding coefficient of 32 to 40 percent, sealing the U-shaped aluminum belt groove and enabling the powder to be accommodated in the U-shaped aluminum belt groove; finally, reducing the diameter by multiple paths of wire drawing until the cored wire with the diameter of 2.0mm is obtained. The cored wire has relatively high amorphous forming ability; the coating prepared by adopting the high velocity arc spraying technology has the advantages of relatively high content, relatively high hardness and double functions of corrosion resistance and wear resistance, and can provide effective surface protection for steel structural components and light alloy parts of marine equipment.