An isolated monoclonal antibody, or an antigen-binding portion thereof, that specifically binds human PD0-L1. A nucleic acid molecule encoding the antibody or antigen-binding portion thereof, an expression vector, a host cell and a method for expressing the antibody or antigen-binding portion thereof are also provided. The present disclosure further provides an immuneconjugate, a bispecific molecule, a chimeric antigen receptor, an oncolytic virus and a pharmaceutical composition comprising the antibody or antigen-binding portion thereof, as well as a treatment method using the antibody or antigen-binding portion thereof.