The invention discloses a method for recovering cobalt sulfate from tungsten waste smelting slag. The method comprises the steps that (1) the tungsten waste smelting slag is subjected to acid leachingtreatment, so that a crude cobalt sulfate solution is obtained; (2) the crude cobalt sulfate solution is mixed with a silicon removing agent for making a reaction, so that reaction slurry is obtained; and (3) the reaction slurry is subjected to solid-liquid separation treatment, so that the cobalt sulfate solution and silicon slag precipitate are obtained. In the manner, the method can effectively recover cobalt sulfate in the tungsten waste smelting slag, can effectively remove the silicon element in the cobalt sulfate solution with the silicon removing rate being more than 95%, can meet therequirement for producing high-quality cobalt products, and is simple in operation, low in input cost and suitable for industrial production.