The invention provides an anti-
human serum albumin nano
antibody and application thereof, and belongs to the technical field of antibodies. The invention provides an anti-
human serum albumin nano
antibody HSA-32 with relatively high affinity, and the anti-
human serum albumin nano
antibody HSA-32 is subjected to humanized transformation, so that three obtained humanized anti-human
serum albumin nano antibodies can be used for reducing the
immunogenicity of the HSA-32 and improving the
immunogenicity of the HSA-32; and high specificity and high affinity of combination with the human
serum albumin and stability and
solubility of the antibody are maintained. The anti-human
serum albumin nano antibody can be used for separation, purification and detection of human serum
albumin and separation and purification of polypeptide,
protein or antibody drugs fused with the anti-human serum
albumin nano antibody. Meanwhile, the anti-human serum
albumin nano-antibody can effectively prolong the half-life period of polypeptide,
protein and antibody drugs fused with the anti-human serum albumin nano-antibody, and can be used for developing long-acting polypeptide,
protein or antibody drugs.