To quantitatively measure the development level of new quality productive forces of water conservancy in a region, based on the concept and connotation, an evaluation method based on the criteria of technological productivity, digital productivity, and green productivity was proposed. An evaluation model based on analytic hierarchy process-entropy weight-TOPSIS was established, and the development level and grade of regional new quality productive forces of water conservancy were quantified. The evaluation model was used to assess the new quality productive forces of water conservancy in the Yangtze River Economic Belt and its 11 provinces and municipalities.The results showed that from 2018 to 2022, the development level of the new quality productive forces of water conservancy in the Yangtze River Economic Belt gradually increased from moderate to high. The overall new quality productive forces of water conservancy in the eastern region was higher than that in the central and western regions. The development level of technological productivity, digital productivity, and green productivity was consistent with the actual situation of policy orientation, economic scale, and resource allocation in 11 provinces and municipalities in the east, central, and western regions. Keywords: new quality productive forces of water conservancy; technology productivity; digital productivity; green productivity; the Yangtze River Economic Belt 〖FL