Method for purifying and producing low-cost environmental-protection level

The invention discloses a method for purifying and producing low-cost environmental-protection level. The method comprises the following steps: 1, putting sodium salicylate raw material into a closedcontainer, adding pure water, stirring and soaking, performing dehydrating treatment after soaking completely, and dissolving with pure water; 2, after dissolving completely, adding ethylenediamine tetraacetic acid into the solution, continuously stirring and performing heat-preserving precipitation; 3, after heat-preserving precipitation, filtering the solution, concentrating and performing cooling crystallization; and 4, after complete crystallization, performing dehydrating treatment to obtain a primary crystal, and performing crystal baking treatment on the primary crystal to finally obtain the product. The primary purification effect is improved and the recrystallization times are reduced by a mode of removing impurities by chelates and removing impurities by an aqueous solution, so that under the condition t