Provided is an anti-interleukin-17A (IL-17A) antibody, a preparation method therefor and an application thereof. Specifically, said antibody is an anti-IL-17A monoclonal antibody. Said antibody can be combined in a highly specific way with an IL-17A antigen, has high affinity and low immunogenicity, and is used for preparing drugs for preventing or treating diseases related to IL-17A, such as any kind of inflammations or autoimmune diseases.