The invention relates to a preparation method for a silver vanadate cathode material. The method comprises the following steps: stirring vanadium source and oxalic acid at certain stoichiometric ratio in solution until the solution becomes blue; then, adding Ag-contained compound; fully stirring; and after drying, heating in the air at the temperature of 300-550DEG C to obtain silver vanadate compound. The preparation technology is simple and is suitable for large-scale production, and a product serves as lithium battery cathode material and has better electrochemistry performance.