Ecological Welfare Performance (EWP) is a core issue in sustainable development and ecological civilization. Although Guangdong Province is one of China’s most developed economies and most highly urbanized areas, there is a gap in the evaluation of the ecological welfare performance of the province. Previous studies have mainly calculated the performance of ecological welfare from a static viewpoint or only from the perspective of network efficiency, and few researchers have considered dynamic characteristics and network structures. This research focuses on 21 prefecturelevel cities in Guangdong Province and measures their ecological welfare performance by applying the dynamic network slacks-based measure （DNSBM） model. Using the Dagum Gini coefficient, this study identifies the sources and contributions of differences in ecological welfare performance among regions in Guangdong Province. The results reveal a low overall level of ecological welfare, with levels of ecological welfare showing an uneven distribution among the 21 cities. EWP and economic growth are spatially mismatched. The overall variations in the ecological welfare performance in the province are mainly due to ultra-high-density contributions. Therefore, we recommend that Guangdong Province strengthen overall regional coordinated development and promote high-quality “shared” development in the northern, eastern, and western areas.