Abstract: In eastern mining regions with high groundwater level, the overexploitation of coal resources leads to extensive surface subsidence and waterlogging, where subsidence areas interconnect to form vast water bodies. Therefore, accurately capturing information on surface subsidence waterlogging and its aquatic environment is crucial for the governance of coal mining subsidence waterlogging areas. This study selects all available Landsat-8 SR images from 2016 to 2024 to map the extent of subsidence waterlogging areas and synthesizes mean value images from June to September to calculate the Forel-Ule Index （FUI）. The results indicate that the coal mining subsidence waterlogging area in Huainan Mining Area fluctuates significantly between 2016 and 2024, presenting an overall “increase-decrease-increase” trend; notably, the apparent decrease in area from 2018 to 2020 is primarily influenced by the installation of floating photovoltaic panels. Specifically, in 2016, the total waterlogging area is 64.76 km², accounting for 11.99% of the total mining area, with seasonal waterlogging area constituting 30.39%. In subsequent years, the water area experiences fluctuations, ultimately increasing to 82.46 km² in 2024. At this point, the waterlogging structure undergoes a fundamental reversal: the seasonal waterlogging area surges to 52.02 km² （accounting for 63.09%）, replacing perennial waterlogging as the dominant type and exhibiting high spatial instability. Furthermore, the water color condition in seasonal waterlogging areas is generally good, mostly ranging between 6 and 9 of FUI, which is superior to that of perennial waterlogging areas. From 2016 to 2024, the area of excellent water color （FUI 6-9） within seasonal waterlogging areas increase significantly from 12.17 km² to 24.69 km², while the area of FUI 10-13 in perennial waterlogging areas remains at a high level for an extended period. This indicates an overall improving trend in the water color of subsidence waterlogging areas in Huainan Mining Area, although perennial waterlogging areas still require focused attention. In terms of waterlogging, the FUI levels of seasonal waterlogging areas are generally lower than those of perennial waterlogging areas. Among the mines in the Huainan Mining Area, the water color in Zhujidong Mine is relatively better, whereas that in the Guqiao and Dingji mines is relatively poorer; however, the overall trend shows that water quality conditions in all mines are gradually improving.