Application of CAY10603 in preparation of medicine for preventing and treating coronavirus

The invention relates to an application of CAY10603 in preparation of a medicine for preventing and treating coronavirus. Specifically, the invention discloses application of CAY10603 or a pharmaceutically acceptable salt, an isotope, a stereoisomer, a mixture of stereoisomers, a tautomer, an ester, an amide or a prodrug thereof in preparation of drugs for prevention and treatment of diseases caused by coronavirus. The coronavirus is a novel coronavirus SARS-Cov-2, a novel coronavirus SARS-CoV, a novel coronavirus HCoV 229E, a novel coronavirus NL63, a novel coronavirus OC43, a novel coronavirus HKU1 and a novel coronavirus MERS-CoV. The diseases caused by the coronavirus are pneumonia or complications of the pneumonia caused by any one of SARS-Cov-2 virus, SARS-CoV virus, HCoV 229E virus, NL63 virus, OC43 virus, HKU1 virus or MERS-CoV virus. The inhibition effect of CAY10603 on the novel coronavirus of new coronal pneumonia is confirmed for the first time, the half effective concentration is low, and the CAY