The present disclosure relates to anti-CD73 antibodies, antigen-binding fragments thereof and use thereof. Furthermore, the present disclosure discloses a murine, chimeric or humanized anti-CD73 antibody or the antigen binding fragment thereof containing a particular CDR region. The present disclosure further comprises a pharmaceutical composition comprising the anti-CD73 antibody or the antigen binding fragment therefor, and its use as a diagnostic agent and therapeutic drug for CD73 related diseases.本公開涉及抗CD73抗體、其抗原結合片段及應用。具體地,本公開公開包含特定CDR區的鼠源、嵌合或人源化抗CD73抗體及其抗原結合片段。本公開還公開包含所述抗CD73抗體或其抗原結合片段的醫藥組成物,以及其作為CD73相關疾病診斷劑和治療藥物的用途。