The invention provides a method for purifying and refining sodium chloride by waste salt of Vitamin C production. The method comprises steps as follows: 1), the waste salt produced in a Vitamin C production process is dissolved in water, a precipitant is added or the precipitant and a precipitation auxiliary are added, and impurities are enabled to be precipitated; the precipitant is a sodium hydroxide solution, and the precipitation auxiliary is one or more of a sodium carbonate solution, a calcium chloride solution and an ammonium carbonate solution; 2), precipitates are decolorized by activated carbon and filtered; 3), a filtrate is subjected to reduced-pressure concentration, purified water is recovered, materials are centrifugally separated, and centrifuged mother liquor is recovered;a wet product obtained after dehydration is dried, and a sodium chloride product is obtained. According to the method for producing industrial salt by refining and purification of the waste salt produced in the Vitamin C production process, the problem about solid waste recycling in the Vitamin C production process is solved. The purification and refining technology is simple, the mother liquor and the purified water are recycled for use, so that the refining cost is low, and product purity is high.