Environmental collaborative governance is an inherent requirement for the construction of ecological civilization in China, and it is also an important part of realizing the modernization of the environmental governance system and governance capacity. Through the field investigation of water loss and soil erosion control in Xingguo County, based on the analytical framework of “precondition-transformation mechanism-efficiency presentation”, the internal logic of momentum transformation into effectiveness of the momentum for environmental collaborative governance is discussed. The results show that on the basis of the socialization of water loss and soil erosion, all stakeholders have reached a consensus on governance, and the generation of momentum for collaborative governance through high-level promotion is the prerequisite for its transformation into efficiency. In the process of momentum transformation, the differential transformation mechanism is used for different types of collaboration, that is, promoting multi department and multi-level collaboration through organization construction and pressure transmission, promoting the coordination of government and community through institutional norms and multiple incentives, promoting the collaboration between local and external governors through multiple driving and complementary advantages. Finally, the effectiveness will be presented as cooperative technological innovation, win-win development governance and collaborative goal promotion. In order to transform momentum into efficiency for environmental collaborative governance, we should pay attention to building precondition for momentum transformation, to generate the momentum for environmental collaborative governance. We should use the differential transformation mechanism according to the internal logic of different collaborative governance actions, and highlight the win-win and sharing of the efficiency of collaborative governance to achieve sustainable momentum transformation.