The method for preparing coal base active carbon with low acid ash-dissolving value and acid iron-dissolving value includes the following steps: pulverizing raw material coal to grain size of 2.0-0.074 mm, using about 5-10% (w/w) of HCl-H2O solution to soak the pulverized raw material coal, boiling, washing, filtering and separating until the filtrate water is closed to neutrality, drying coal powder, adding tar, stirring, kneading, extruding strip, drying by airing, carbonizing and activating so as to obtain the invented column active carbon, then soaking said obtained active carbon with 5-10% (w/w) of HCl-H2O solution, boiling, washing, filtering and separating, soaking in water and washing, filtering and separating, drying so as to obtain, its end product. |