Based on hourly precipitation and topographical data in southwestern Sichuan, the spatiotemporal distribution of hourly heavy rainfall (HHR) and the statistical characteristics of heavy rainfall events (HRE) with different durations were analyzed. The results show that: (1)This heavy rainfall event was characterized by its prolonged duration, extensive impact area, large cumulative precipitation, high frequency of rainfall events, and significant short-duration intense precipitation. (2) HHR was influenced by topography, with high-value areas primarily distributed along the Longmen Mountains, the Qingyi River Basin, and Mount Emei. The dual typhoon effect and topographic forcing contributed to the intensification and persistence of the rainfall. (3) HHR experienced four peaks, with the fourth peak being the strongest and most active under the influence of the plateau shear line, reaching a maximum rainfall of 178.3 mm. (4) Long-duration HREs had the highest proportion, with precipitation mostly exceeding 200 mm. The precipitation amounts of short- and medium-duration HREs were mostly in the ranges of 20, 50) and 50, 100) mm, respectively, and the maximum precipitation increased with the duration. (5) Spatially, long-duration HREs had higher precipitation and frequency than short- and medium-duration HREs, with high-value areas located in the central part of Ya’an and Mount Emei.