The invention discloses a preparation process for a silver metallic oxide electric contact material. The preparation process includes the following steps that (1) silver, metal component additives andother additives are smelted to form molten alloy; (2) alloy spheres are formed by the molten alloy; (3) the alloy spheres are dried; (4) the alloy spheres with the diameter being 0.5-5 mm are screened out; (5) the alloy spheres are graded according to the grade that the diameter is increased by 0.5 mm each time; (6) the graded alloy spheres are oxidized under the set temperature, pressure and time conditions; (7) the oxidized alloy spheres are combined and pressed into ingots; (8) the ingots are sintered and extruded into thick silver metal oxide wire rods; and (9) the silver metal oxide wirerods are drawn to the finished product specifications. The process has the advantages that the material utilization rate is high, a small number of work procedures are needed, the production period is short, and no lean oxide region exists.