Preparation method of multilayer alloy wear-resistant composite material

The invention discloses a preparation method of a multi-layer alloy wear-resistant composite material. The multi-layer alloy wear-resistant composite material sequentially comprises a carbon steel layer, a high-chromium cast iron middle layer and a hard alloy layer from top to bottom. The high-chromium cast iron is prepared from the following components in percentage by mass: 14.0 to 25.0 percent of Cr, 2.8 to 5.0 percent of C, 0.5 to 4.5 percent of V, 0.5 to 0.7 percent of Mn, 0.7 to 1.0 percent of Si, 0.05 to 0.1 percent of Mo, 0.4 to 2.0 percent of Ti, 0.8 to 1.5 percent of Ni and the balance of Fe. The high-chromium cast iron layer and the hard alloy layer with good wear resistance are added on the basis of carbon steel, so that the wear resistance of the composite material can be improved to a great extent; in addition, the high-chromium cast iron is adopted as the middle layer and has a good bonding effect with the hard alloy and the carbon steel, the strength of a bonding interface can be guaranteed, a