Abstract: A type of Bruton's tyrosine kinase inhibitor, a preparation method therefor, and an application thereof in the field of medicine. The Bruton's tyrosine kinase inhibitor may be used for preventing and/or treating a disease related to Bruton's tyrosine kinase mediation, such as an autoimmune disease, cancer, or an inflammatory disease. Through experimental research, the provided compound has high selectivity with respect to a Bruton's tyrosine kinase target, and can exhibit a uniquely advantageous medicinal effect in an in vivo animal experiment.