1种高比表、高活性、高稳定性的铬基氟化催化剂及其制备方法。该发明所述铬基氟化催化剂包括第1活性成分和第2活性成分,其中第1活性成分为Cr;第2活性成分选自Mg、Zn、Al、Co、Y、Ga或Pr中的1种或2种以上组合;第2活 A kind of chromium-based fluorination catalyst with high specific surface, high activity and high stability and a preparation method thereof. The chromium-based fluorination catalyst of the present invention comprises a first active ingredient and a second active ingredient, wherein the first active ingredient is Cr; the second active ingredient is selected from 1 of Mg, Zn, Al, Co, Y, Ga or Pr Species or combinations of 2 or more species;