The monoclonal IgG-type antibodies comprising variable domains represented by a combination of VHH-derivative with a variable domain of the light chain V L are offered. The said antibodies can comprise amino acid substitutions at positions 44 and 45 (Kabat numbering) or combinations thereof. Antibodies of the invention possess increased affinity and improved aggregation stability.本發明公開了一種基於VL和VНН可變區衍生物的高親和力抗聚集抗體,所述抗體中的可變區是VНН衍生物與輕鏈VL可變區的結合。所述抗體包含在44和45位的胺基酸取代或兩者的結合,具有高親和力和聚集穩定性,可用於製備治療IL-17A介導的疾病或失調的藥物,屬於生物醫藥技術領域。