An anti-PD-1/anti-VEGF natural antibody structure-like heterodimeric form bispecific antibody and the preparation thereof. Provided are a highly stable, heterodimeric form anti-PD-1/anti-VEGF bispecific antibody having natural IgG characteristics and free of mismatched heavy and light chains and a preparation method for the antibody. The bispecific antibody is capable of simultaneously binding with two target molecules and provides improved efficacy in treating a complicated disease.