Abstract: Electrons in the energy range of 10–100 keV are important energetic particle components in the magnetosphere, and they play a key role in many physical processes in the magnetosphere. However, many scientific questions about these processes are still unanswered. High spatiotemporal and energy-resolution imaging detection of 10–100 keV electrons is of great significance for solving these scientific problems. The traditional space particle detection technology cannot effectively detect the medium-energy electrons in this energy range. In this project, we propose combining low-noise particle detection technology with pinhole imaging technology to achieve high-resolution imaging detection of 10–100 keV medium-energy electrons in the magnetosphere, and at the same time achieve miniaturization (≤3.2 kg and size of 150 × 150 × 170 mm) and low power consumption (≤5 W) of the instrument, which can be used for space physics research and space weather applications in the future.