Grazing livestock dung deposition is one of the important ways to affect the dynamics of grassland soil nutrients, and dung decomposition can directly control nutrient release and therefore may generate significant effects on the soil nutrients balance and available nutrient supply for vegetation growth in grassland ecosystems. In this study, we systematically analyzed the characteristics of livestock defecation behavior, the material composition and degradation process of livestock feces, and emphasized the effects of dung nutrient inputs on the dynamics of soil nutrient contents. These explorations clearly elucidated the relationship between mobility and transfer of livestock dung nutrients and dung pat decomposition, and examined the influential effects and functional mechanisms of dung nutrient inputs on the nutrient biogeochemical cycles in grazing grassland ecosystems. Thus, it strengthens our understanding of the temporal and spatial dynamics of dung nutrients and pat decomposition processes and improves our understanding of the theoretical basis of the mechanism of nutrient migration and transformation in the fecal-plant-soil system. The conclusions of this paper could provide a series of positive scientific evidence for optimizing livestock waste management models, maintaining soil nutrient balance, and promoting the healthy, coordinated, and sustainable development of natural grassland ecosystems.