Abstract: Based on the CN05.1 gridded daily precipitation dataset from 1961 to 2023, the spatiotemporal characteristics of autumn precipitation in the Sichuan-Chongqing region under the new climate state were analyzed using linear trend analysis, wavelet analysis, and the M-K test.The results show that: (1) Over the past 63 years, the interannual variation of autumn precipitation in the Sichuan-Chongqing region has been remarkable, with an overall decreasing trend at a rate of −0.45 mm/a. Since the 1990s, precipitation has been below the climatological average, persisting into the early 2020s. An abrupt climate change from wet to dry occurred around 1983, with the annual precipitation decreasing by 30.56 mm on average before and after the shift. (2) The spatial distribution of total autumn precipitation is uneven, with precipitation maxima and the centers of high interannual variability both located in central-southern Sichuan and the northeastern part of the Sichuan-Chongqing region. Spatially, the interannual variability shows a consistent decreasing trend across the entire region. (3) The frequency of heavy rain and torrential rain has decreased, while the intensity of torrential rain has increased. The frequency and intensity of extreme torrential rain have both intensified, leading to enhanced precipitation extremity. After 1983, the intensity of moderate and heavy rainfall decreased in western Sichuan, while the intensity of extreme torrential rain increased in central-eastern Sichuan. (4) Modreate rain, heavy rain, torrential rain and extreme torrential rain in autumn are mainly concentrated in central-southern Sichuan and eastern Sichuan-Chongqing region, with their largest contributions to total autumn precipitation being 44.6%, 27.2%, 15.9%, and 4.2%, respectively.