The application discloses a CDK4 / PARP1 dual-target inhibitor and application, belongs to the medical technology field, solves the problems of poor effect of a single CDK4 inhibitor and weak activity of a single PARP1 inhibitor, the inhibitor is a compound with structural general formula A-
Linker-B, or a pharmaceutically acceptable salt, solvate,
hydrate or
prodrug thereof, the dual-target inhibitor disclosed in the application can effectively overcome the defects of poor effect of a single CDK4 inhibitor and weak activity of a single PARP1 inhibitor, and has a strong
inhibitory effect on CDK4 and PARP1, and has a good application prospect.