The invention discloses an abrasion-resistant polycrystalline diamond (PCD) clad sheet binding agent and a preparation method thereof. The preparation method comprises the steps that 1) nanosilicon dioxide and hydrochloric acid are dispersed into an alcohol-water solution, then sodium salt, aluminum salt, boric acid, zircon salt, yttrium salt, nickel salt and tetrabutyl titanate are added into thesolution and mixed, then alkali liquor is added dropwise and stirred, and finally, ageing and drying are performed so as to obtain xerogel; 2) heat treatment is performed on the xerogel so as to obtain heat treatment products; and 3) the heat treatment products, zinc powder, molybdenum powder, titanium powder and aluminum powder are subjected to ball milling so as to obtain the abrasion-resistantPCD clad sheet binding agent. By means of the binding agent, prepared PCD clad sheets are made to have the excellent abrasion resistance, and meanwhile, the preparation method has the advantages of simple procedures and easy and convenient operation.