The invention belongs to the field of metal material surface wear-resistant coatings and relates to an amorphous strengthened tungsten carbide coating and a preparation method thereof. The amorphous phase doped high-wear-resistance WC coating is prepared on the surface of a metal workpiece through the hypersonic flame spraying technology. The preparation method comprises the following steps of conducting cleaning and sand blasting treatment on the surface of the metal workpiece; adopting tungsten carbide, binding phase metallic cobalt and amorphous alloy mixed powder as a coating raw material,wherein the coating raw material comprises, by mass, 70-90% of WC, 5-20% of binding phase metallic Co and 1-15% of amorphous alloy; and preparing the amorphous/nanocrystalline phase doped WC coatingthrough the hypersonic flame spraying technology. An amorphous phase can serve as a second strengthening phase of the coating through the characteristics of high hardness and high corrosion resistance, and the wear resistance and corrosion resistance are improved. When the temperature of the coating is increased or the coating is under a heavily stressed condition during the service process, the amorphous phase has crystallization conversion to separate out nanocrystalline in situ, and the nanocrystalline with the high crystal boundary density can serve as the toughening phase, the toughness of the coating is improved, and the reasonable matching effect of the hardness and toughness required by the wear-resistant coating is achieved.