Ferroelectric thin films capacitors have been potentially applied in advanced electronics and electric power systems because of their high power densities and fast charge-discharge responses. However, continuous operation of the ferroelectric thin film capacitors under elevated temperatures and high electric fields still remains a huge challenge. Herein, we report eco-friendly BiFeO-modified BiNdTiZrO(BNTZ) free-lead ferroelectric thin films for high-temperature capacitor applications that simultaneously possess high-energy storage density (W), efficiency (η), and temperature-dependent stability. The BNTZ-0.09BFO thin film shows a first-class-levelW(∼124 J cm) along with highη(∼81.9%), which surpasses almost all the Pb-contained and Pb-free perovskite ferroelectrics. Of particular importance is that excellent fatigue endurance for long-term stability (10cycles) and thermal stability (−100 °C to 200 °C) could be achieved. This work represents a new design paradigm to exploit advanced dielectric capacitor materials for high-temperature electronics and energy storage devices.