[Objective] To explore the interactive relationship and coordination effect between urban land green utilization efficiency and urban high-quality development, so as to provide scientific support for promoting the transformation of urban land green utilization and realizing regional high-quality development. [Method] Taking 41 prefecture-level cities in the Yangtze River Delta region as the object, we constructed the evaluation index system, measured the indexes of urban land green utilization efficiency and high-quality development from 2008 to 2022 by using the non-expected output Super-EBM and the entropy value-TOPSIS model, and revealed the interaction relationship between the two by using the PVAR model, with the help of the revised coupling and coordination model and the GM(1,1) gray model. The PVAR model is used to reveal the interaction between the two, and the modified coupling coordination model, GM (1,1) gray prediction model are used to explore the spatial and temporal characteristics of the coupling coordination and future trends. [Results] (1) The green land use efficiency of urban land in the Yangtze River Delta (YRD) region is “M-shaped” fluctuating and rising, presenting the spatial characteristics of “west retreating, east advancing, and pan-homogenization”; the non-linear growth characteristics of high-quality development are obvious, and “polarization radiation - trunk line extension” is the most important feature of urban land use efficiency. Polarization radiation - trunk line extension” spatial pattern is prominent. (2) There is a two-way causal interaction between the two, and at the same time by their own and each other"s double impact, but more influenced by their own structure, with inertial dependence characteristics, and high-quality development of urban land green utilization efficiency is more effective. (3) The level of coupling and coordination of the two systems is growing steadily, with Shanghai > Jiangsu > Zhejiang > Anhui, generally showing the spatial characteristics of “high in the south and low in the north, high in the east and low in the west, and rising in the center”, and the pattern of the “Z-shaped” axes with the developed cities as the core is becoming clearer; the future is bright. The level of coordination will continue to improve, but the “core-edge” distribution pattern will be consolidated. [Conclusion] By closely following the “five development concepts”, updating the land use management mode and integrating the interaction and symbiosis between the two, the coordinated development of the region will be promoted.