Provided are an anti-PD-1 antibody, an antigen-binding fragment thereof, and a pharmaceutical use thereof. Specifically, provided are a humanized anti-PD-1 antibody containing a specific CDR region and an antigen-binding fragment thereof, a pharmaceutical composition containing the anti-PD-1 antibody and the antigen-binding fragment thereof, and a used thereof as medicament. In particular, provided is a use of the humanized anti-PD-1 antibody in the preparation of the medicament for treating PD-1 associated diseases or disorders.