The urban agglomeration in the Yangtze River Delta is the one with the highest level of urbanization and economic development in China. Its "production-living-ecological" function problems and contradictions have become increasingly prominent. The coupling and coordination analysis of "production-living-ecological" functions is the basis of land space planning and regional sustainable development. Taking the Yangtze River Delta urban agglomeration as the research area, 31 indicators were selected from six aspects of agricultural production, non-agricultural production, living standards, living security, ecological pressure and ecological security to construct the evaluation index system of " production-living-ecological " functions. The entropy weight method and AHP method were used to determine the weight of the evaluation index. The coupling coordination degree model was introduced to evaluate the"production-living-ecological " functions and analyze its coupling coordination degree from 2000 to 2019. The panel data model and Robust regression were used to analyze the main factors affecting the "production-living-ecological " functions in the study area.The results show that:(1) The production, living and ecological functions of the study area have improved steadily from 2000 to 2019. Among them, the development of production function in the east and west is better than that in the middle, and the low value area is reduced.; The living function of the east is better than that of the west, and that of the south is better than that of the north.; The ecological function shows the best change characteristics from southwest to southeast over time. The overall performance of ‘production-living-ecological’ functions is ‘the east is better than the west, the south is better than the north, and the southeast is the best’ pattern, with obvious spatial differences; (2) The proportion of cities with severe production-life imbalance decreased from 23.08% to 0, the proportion of cities with basic coordination increased from 11.54% to 46.15%, the proportion of cities with moderate coordination increased from 0 to 53.85%, and the coupling coordination increased significantly;The proportion of cities with moderate production-ecological imbalance decreased from 57.69% to 4.8%, and the proportion of cities with basic coordination increased from 19.23% to 88.46%; the proportion of cities with severe and moderately unbalanced life-ecological coupling ranges from existence to none;the proportion of moderate coordinated cities increased from 0 to 88.46%, and Shanghai increased to highly coordinated cities;The coupling coordination degree of production, living and ecological functions gradually increased. The spatial distribution pattern showed that the eastern and southeastern regions were the main high-value regions, and the coastal regions were better than the inland regions. (3) Factors such as total power of agricultural machinery per land, investment in fixed assets per land, per capita disposable income of urban residents, grassland area, green coverage rate and other factors have contributed to the coordinated development of the "production-living-ecological "functions in the study area,having a huge driving force, and the per capita disposable income of rural residents has restricted the function of production-living-ecological coupling and coordination. The results can provide a reference basis for the stable development of its social economy and the sustainable development of land space resources utilization.