A process for purifying lithium chloride (LiCl) from industry grade LiCl and hydrochloric acid includes mixing the above raw materials, adding barium chloride and lithium hydroxide to PH=9-13, adding lithium oxalate or oxalic acid under normal temperature and stir to get the mixture of precipitation of barium sulfate, calcium oxalate, magnesium hydroxide and ironic hydroxide, passing the mixture through a membranous filter to get rid of the ions of sulfate, calcium, magnesium and iron, adding a reagent LF with a composition of Li1+xAxB2-x(PO4)3 under normal temperature, ordinary pressure, and PH9-13, purifying 6-96 hours with stir, passing it through a membranous filter again, concentrating and drying. The pureness of lithium chloride obtained is higher than 99.9%, and Na<30ppm, K<10ppm, Ca<20ppm, Mg<10ppm, Fe<5ppm.