The invention relates to an economic method for removing chloride ions in a copper sulphate solution. The method comprises the following steps: adjusting a pH value and oxido reduction potential and adjusting copper sulphate with sodium carbonate and sodium sulfite to a reaction interval where Na2[CuCl3] can stable exist; carrying out heating, adding elemental copper powder, allowing Na2[CuCl3] in the solution and the elemental copper powder to undergo comproportionation so as to produce a white CuCl cuprous salt precipitate insoluble in water; and carrying out full cooling to separate cuprous salt sediment and the copper sulphate solution so as to obtain a dechlorinated copper sulphate solution. The method utilizes the characteristic that wet cuprous salt sediment is not stable under the condition of a high pH value to convert the wet cuprous salt sediment into dechlorinated copper residues consisting of CuO, CuCO3 and Cu(OH)2 and to return the dechlorinated copper residues into a system for reuse, and a produced sodium chloride solution has high concentration and can be directly used for evaporative preparation of industrial NaCl. The method is widely applicable to removal of chloride ions of various concentrations from high-concentration copper sulphate solutions; reagents added for reaction do not influence quality; except cost for heating, operation cost is negligible; and the method is economic and easily practicable.