Global climate change affects hydrology and ecology, and aggravates the contradiction between water resources supply and demand, thus leading to transboundary water conflict and cooperation attracting increasing attention. This paper uses the precipitation data sourced from the Global Precipitation Climatology Centre, hydropolitical data collected from the Transboundary Freshwater Disputes Database and, for approximately half a century of socioeconomic indicator for countries, to discuss the relationship between precipitation change and transboundary hydropolitics. As demonstrated by the panel regression results, lower precipitation would lead to more water conflicts and more significant change of precipitation would lead to more water hydropolitical events. This result remains robust after adjustment being made to the defined thresholds of conflict and cooperation. The findings suggest that the countries in a transboundary river ought to avoid conflict and seek more cooperation, considering the uncertain prospect of precipitation changes.