Method for separating arsenic from copper sulfate solution

The invention discloses a method for separating arsenic from a copper sulfate solution. The method for separating arsenic from the copper sulfate solution comprises the steps of pretreatment, oxidation, arsenic removal and aftertreatment, and specifically comprises the following steps: adding water into crude copper sulfate for dissolving to obtain a crude copper sulfate solution a; adding an oxidizing agent for reaction to obtain reaction liquid b; adding a dearsenification agent for dearsenification reaction to obtain reaction liquid c; adding a flocculating agent into the reaction liquid c for settling, and performing liquid-solid separation to obtain an arsenic-removed copper sulfate solution and purified residues; the arsenic-removed copper sulfate solution can be crystallized to produce a copper sulfate product or electrodeposited copper; and returning the purified slag to a pyrogenic copper smelting system to recover copper. According to the method, arsenic in the crude copper sulfate solution is effic