Implementing Rural Public Cultural Services (RPCS) is a key action to improve the overall spiritual-cultural life in rural areas. Co-design is an important way to improve the quality of RPCS. Urban-rural integration and integrated construction are inevitable requirements for the development of RPCS. Regarding the problems existing in the current rural public cultural services, the paper discusses the design mechanism of multi-actor collaboration from the perspective of urban-rural integration. The goal is to effectively realize the co-building & sharing of RPCS and the innovative development of rural culture. By adopting the methods of literature research and case study, the paper defines the connotation of co-building & sharing under the collaborative relationship between urban and rural areas, deeply analyzing Eden project as a successful case which is based in Cornwall in England. As a result, the paper constructs the urban-rural collaborative service design mechanism based on the service theory perspective of “service-dominant logic” and “design for service”. Through the integration of urban and rural advantageous capital, the construction of urban and rural collaborative networks and the realization of urban and rural value co-creation, the problem of insufficient endogenous motivation in rural public cultural services can be effectively solved, service efficiency can be improved, and the collaborative construction of public culture can be promoted.