Ecological carrying capacity accounting is an important foundation of scientific protection and effective use of the protected areas. Multi-type protected areas are geographically distributed, adjacently connected, and overlapped areas. This study relates the functional space of multiple types of protected areas and the ecosystem services, and divides them into the ecological space, production space, living space and recreation space. On this basis, the ecological carrying capacity of multiple types of protected areas is defined as the ecosystem's ability to maintain its ecosystem services in those four types of space. The ecological carrying capacity of multiple types of protected areas is divided into natural foundational carrying capacity, socio-economic activity carrying capacity, and recreational carrying capacity. An ecological carrying capacity accounting framework model suitable for multi-type protected areas is constructed. This study takes the Yellow River Source Park of Sanjiangyuan National Park as a case area to evaluate its ecological carrying capacity. This study can provide a scientific foundation for research on the economic construction scale, structure and layout optimization of multi-type protected areas.