Nanometer/ultrafine WC-Co composite powder and preparation method thereof

The invention discloses a nanometer/ultrafine WC-Co composite powder and a preparation method thereof. The preparation method comprises the following steps that 1, a tungstate solution and a tungstenprecipitant solution are mixed and react so as to obtain tungsten precipitates; 2, a cobalt salt solution is mixed with a cobalt precipitant solution to react so as to obtain cobalt precipitates; 3, the tungsten precipitates and the cobalt precipitates are mixed with carbon black to perform ball milling and compaction so as to obtain composite powder; and 4, the composite powder is conveyed to a vacuum furnace to perform in-situ one-step reduction carbonization reaction so as to obtain the nanometer/superfine WC-Co composite powder. According to the preparation method, the characteristic of elements distributed in atoms or molecules in a solution method is fully utilized, the characteristic that distribution of all the components in the ball milling mixing process is uniform and can promote reactions is also fully