Abstract: The present invention relates to a use of mutant haptoglobin having angiogenesis-promoting activity and, more particularly, to a mutant haptoglobin polypeptide, a recombinant vector containing a polynucleotide encoding the polypeptide, or a composition for promoting angiogenesis containing, as an active ingredient, a transformant transformed with the recombinant vector. The mutant haptoglobin according to the present invention includes an amino acid sequence of SEQ ID NO: 1 in which the 143rd amino acid is substituted with an amino acid other than Arg. The mutant haptoglobin according to the present invention has excellent angiogenesis-promoting activity and excellent capillary-like tube formation capability as compared with wild-type haptoglobin, and promotes cell migration, and thus is useful as a therapeutic agent for treating diseases caused by non-angiogenesis.