Method for selective extraction of gallium and germanium from oxalic acid solution containing gallium and germanium

The invention discloses a method for selective extraction of gallium and germanium from an oxalic acid solution containing gallium and germanium. The method comprises the following steps of carrying out single-stage or multistage countercurrent extraction on the oxalic acid solution containing gallium and germanium by an organic phase, carrying out single-stage or multistage countercurrent selective gallium-back-extraction on the carrying organic phase obtained by the above single-stage or multistage countercurrent extraction to extract gallium, and carrying out germanium back-extraction on the organic phase obtained by the gallium-back-extraction by an alkali solution to respectively obtain a gallium-containing aqueous solution and a germanium-containing aqueous solution. The method effectively realizes separation of gallium and germanium from impurities such as copper and zinc, has a short flow process, small chemical reagent consumption and a low cost and can easily realize industrialization.