Flexible thin film with both good ferroelectric and ferromagnetic properties has more extensive applications in the field of flexible and/or wearable devices and sensors. In this experiment, the flexible Bi0.9Gd0.1Fe0.98Mn0.02O3 (BGFMO) thin film is successfully deposited on fluorophlogopite (F-Mica) single-crystalline substrate by sol–gel method. The flexible BGFMO thin film exhibits a rhombohedrally distorted perovskite structure, uniform grain size, and a relatively smooth surface. It has good ferroelectricity, with a remnant polarization (Pr) value of 74.88 μC/cm2 and ferromagnetism with anisotropic saturation magnetization (in-plane saturation magnetization of about 32.00 emu/cm3, out-of-plane saturation magnetization of about 29.80 emu/cm3). The flexible thin film can maintain good ferroelectric properties at different frequencies and temperatures, and the ferroelectric properties can be adjusted by mechanical bending. Therefore, the flexible BGFMO thin film with excellent ferroelectric and ferromagnetic properties has great application potential in flexible electronic devices. [ABSTRACT FROM AUTHOR]