Provided is an
antibody-
drug conjugate having a structure represented by formula (I): Ab-(L-D)n (I), wherein Ab is an anti-
interleukin 6
receptor antibody or an
antigen-binding fragment thereof, D is a
drug, L represents a linking group for linking Ab and D, and n is 1-10. The
antibody or the
antigen-binding fragment thereof comprises at least one light chain and at least one
heavy chain. In addition, provided is use of the antibody-
drug conjugate. The antibody-drug conjugate can significantly reduce the administration dosage, improve the tolerance of patients, and reduce adverse reactions.