The invention discloses a method for decolorizing industrial phosphoric acid. The method comprises the following steps of: desulfurizing phosphoric acid obtained after primary concentration by using barium carbonate; precipitating after the desulfurized phosphoric acid is qualified; filtering supernatant obtained after the precipitation, and then conveying to a secondary concentration system by using a pump for concentration; decolorizing 85 percent phosphoric acid obtained by concentration by using activated carbon; and filtering decolorization feed liquid by using a filtering machine, and thus obtaining a qualified finished product, namely the 85 percent industrial phosphoric acid. Due to the adoption of one-time decolorization process, process flows are simplified, and equipment investment is reduced; and simultaneously, 75 percent industrial phosphoric acid and 85 percent industrial phosphoric acid can be produced at the same time.