Method for recovering precious metal gold in gold film wet etching liquid

The invention discloses a method for recovering precious metal gold in a gold film wet etching solution, which comprises the following steps: preparing a saturated sodium sulfite aqueous solution, adding the saturated sodium sulfite aqueous solution into a solution to be recovered according to a ratio of 1: 20, uniformly stirring and mixing the two solutions, standing for 1-3 hours, pouring the mixed and stirred solution into a filtering device, carrying out suction filtration by using medium-speed filter paper, and drying to obtain the precious metal gold in the gold film wet etching solution. And the filter paper with the crude gold is put into a drying oven to be fully dried, after full drying, the crude gold is separated through a brush and further purified into pure gold, and generated waste liquid is subjected to the process again to be subjected to secondary reduction purification. The method for recycling the precious metal gold in the gold film wet etching solution has the advantage of being low in r