Collaborative governance refers to the important form and process of international actors focusing on homogeneous issues and related governance systems to coordinate global governance practice. Against the backdrop of an increasingly intertwined global agenda for food security and climate governance, promoting collaborative governance between the two is of practical significance for achieving the global Zero Hunger and enhancing climate change adaptability. As the core institution of the complex system for food security, FAO has deepened the conceptual connection between the two issues. Simultaneously, it has continuously strengthened the construction of mechanisms to promote collaborative governance between the two issues and actively incorporates climate risk assessments into its food security project plan. However, due to the relatively limited support of climate governance mechanisms for food security issues, and constrained resource allocations for climate-related topics by FAO, there is still considerable room for improvement in its effectiveness in participating in collaborative governance of global food security and climate change.