This study presents transmissive thin-film scintillators made from CsPbBr₃ perovskite nanocrystals for real-time single-proton counting. These nanocrystals exhibit high light yield (≈100,000 photons per MeV) and fast response (≈336 ps), enabling high sensitivity and ionostability. Proton-induced luminescence arises from biexciton generation via upconversion and impact ionization, allowing detection of as few as seven protons per second. The scintillators show exceptional performance in single-proton tracing, patterned irradiation, and super-resolution proton imaging. They outperform conventional scintillators in light yield and stability, with a detection limit of 7 protons per second, making them suitable for proton therapy and radiography. The scintillators are fabricated as thin films, enabling non-invasive, real-time proton counting. The study demonstrates their potential for high-sensitivity proton detection and accurate dose control in clinical applications.This study presents transmissive thin-film scintillators made from CsPbBr₃ perovskite nanocrystals for real-time single-proton counting. These nanocrystals exhibit high light yield (≈100,000 photons per MeV) and fast response (≈336 ps), enabling high sensitivity and ionostability. Proton-induced luminescence arises from biexciton generation via upconversion and impact ionization, allowing detection of as few as seven protons per second. The scintillators show exceptional performance in single-proton tracing, patterned irradiation, and super-resolution proton imaging. They outperform conventional scintillators in light yield and stability, with a detection limit of 7 protons per second, making them suitable for proton therapy and radiography. The scintillators are fabricated as thin films, enabling non-invasive, real-time proton counting. The study demonstrates their potential for high-sensitivity proton detection and accurate dose control in clinical applications.