The rapid advancement of Internet of Things (IoT) technology has enhanced the integration of physical and information networks within park-level integrated energy systems, leading to the development of IoT-enabled Park-level Integrated Energy Systems (IPIES). These systems efficiently manage vast energy data volumes, facilitating multi-park energy sharing. This paper introduces a multi-IPIESs energy sharing service mechanism based on cooperative game theory, which incorporates the sharing economy concept into energy services. The paper outlines an architecture and detailed business process for the service, establishes a coordinated operational model to minimize comprehensive costs, and develops models for equitable benefit allocation and cost settlement among participants. Simulation results demonstrate the mechanism’s effectiveness in promoting energy sharing, reducing operational costs, and enhancing resource efficiency within the IPIESs group.