In order to ensure the safety of urban drainage and alleviate urban waterlogging, this study focuses on the impact of dynamic river water levels on pipeline drainage. The region south of Yiwu River in Yiwu City was selected as the study area. Utilizing the Mike modeling platform, simulations were conducted to assess pipeline drainage outlets under heavy rainfall conditions with return periods of 2-year, 3-year, and 5-year. These simulations considered connections to both the river's normal water level and various flood scenarios based on different design frequencies. The study also analyzed the influence of changes in river water levels on the drainage capacity of the pipeline network and their impact on urban waterlogging. This research provides a reference basis for understanding the causes of urban waterlogging in the study area and its mitigation.