[en] Highlights: • A high-performance piezoelectric nanogenerator was proposed based on formamidinium lead halide perovskite nanoparticles. • FAPbBr₃ NPs were dispersed homogeneously in the PVDF matrix and formed a uniform nanocomposite. • The maximum output voltage and current density can reach up to 30 V and 6.2 μA cm⁻². Formamidinium lead halide perovskite nanoparticles (FAPbBr₃ NPs), because of their prominent piezoelectric properties, have drawn increasing attention in the fields of piezoelectric applications. Remarkable enhancement of piezoelectric power output is achieved from a piezoelectric composite nanogenerator by combining the FAPbBr₃ NPs with poly(vinylidene fluoride) (PVDF) polymer. The FAPbBr₃ NPs @ PVDF composite based piezoelectric nanogenerators show the highest outstanding outputs with voltage of 30 V and current density of 6.2 μA cm⁻² for organic-inorganic lead halide perovskite material based devices. The improved performance can be ascribed to the using of PVDF, piezoelectric polymer as matrix, as well as the homogeneous distribution of FAPbBr₃ NPs with enhanced stress on piezoelectric nanoparticles. The alternating energy generated from the nanogenerator can be utilized to charge a capacitor through a bridge rectifier and light up a commercial light-emitting diode (LED). Our obtained results open the feasibility of organic-inorganic lead halide perovskite materials for the design and development of high-efficiency energy harvesting applications.