Treatment method for recycling arsenic and cadmium separation resources in precious metal smelting wastewater

The invention provides a treatment method for recycling arsenic and cadmium separation resources in precious metal smelting wastewater. The treatment method comprises the following steps: adding an activator into wastewater, carrying out activation, adding a vulcanizing agent into the activated wastewater so as to remove arsenic, carrying out filtering, and adding a vulcanizing agent into the filtered wastewater again so as to remove cadmium, wherein the activator is one or more selected from the group consisting of sulfuric acid, sulfur dioxide and sulfurous acid; the activator can also be sulfite; and the vulcanizing agent is hydrogen sulfide or sodium sulfide. The treatment method provided by the invention solves the problems of high treatment cost of hazardous waste slag and difficultrecycling of valuable resources in the wastewater for a traditional process treatment method, can effectively enrich and reuse valuable metal resources in the wastewater, has simple process and easily-controllable steps, and