Ferroelectric thin film materials have been widely applied in a great many fields for their robust spontaneous electric polarization and strong coupling with optical, electric and magnetic fields. In recent years, breakthrough progress has been made in the performance optimization and applications of these materials. Composition control and various types of strain can effectively regulate the performance of ferroelectric films, including ferroelectric hysteresis loop, Curie temperature, leakage current, etc., to meet the application requirements of ferroelectric devices in various fields. Flexible ferroelectric thin film devices with excellent ductility and resilience have amazing application potential in intelligent robots, wearable electronic devices and the Internet of Things, expanding the application field of ferroelectric thin film materials. We briefly introduce the fabrication processes and application prototypes of flexible ferroelectric thin films. We conclude with limitations of existing research on ferroelectric thin film materials and suggestions for further research.