Solar-induced chlorophyll fluorescence (SIF) is a spectral signal emitted by plants under sunlight irradiation, directly reflecting the intensity of photosynthesis and is of great importance for land vegetation observation. However, the spatial and temporal resolutions of global SIF sensors is limited, making it difficult to capture intra-day changes in photosynthesis. In this study, we reconstructed a 1-hourly and 0.05° spatially resolved SIF dataset for July, August, and September of 2019—2022 in East Asia using data from the Orbiting Carbon Observatory-3 (OCO-3) and Himawari-8 satellites, which were launched on the International Space Station and are geostationary satellites, respectively. The results show that the SIF values of vegetation in East Asia gradually increase in the morning, reach a peak at noon, and gradually decrease in the afternoon. The intra-day SIF variations in different months show obvious seasonal characteristics, which are related to abundant sunlight and high temperatures in summer. The differences in intra-day SIF variations between different vegetation types reflect their characteristics in photosynthetic response. These results contribute to a deeper understanding of the spatial and temporal dynamics of vegetation in East Asia, providing important scientific basis and references for ecosystem management, agricultural production, and climate change response strategies.