As green innovation gains traction and its benefits become evident to firms and society, scholarly attention has shifted from potential future returns to the actual implementation of green innovation practices. While corporate green development has attracted growing interest, how executive mobility contributes to the diffusion of green innovation across firms remains under-investigated. Drawing on behavioral consistency and upper echelons theories, this study investigates whether, and to what extent, executive migration facilitates the spillover of green knowledge and practices. Using comprehensive data combining green patents and executive migration records, we document a positive relation between the green innovation performance of origin and destination firms linked by migrating executives. These spillovers remain robust after multiple checks and addressing endogeneity concerns. The effect is contingent on executive power, salary level, job migration attributes, and various province-, firm-, and executive-level characteristics. Overall, this study highlights the role of executive mobility in driving green innovation spillovers across different contexts.