In the era of digital economy，China's “dual-carbon”strategy drives the transformation of its economy toward high-quality development. Therefore，this study investigates the spatiotemporal characteristics and spatial effects of carbon emissions across 285 cities. The results indicate that:（1）Both urban carbon emissions and digital economy development exhibit spatial correlations；（2）A “club convergence”phenomenon exists among regions at different development tiers，with the digital economy demonstrating a pronounced “Matthew effect”in interregional development trends，while urban carbon emissions display a downward transfer pattern；（3）Spatial econometric models reveal that the digital economy exerts significant spatial spillover effects on carbon emissions. Industrial structure shows notable short-term spillover effects，whereas research investment demonstrates stronger direct effects in the long term.