Abstract: The performance of facesheet/core interface is the key for the composite sandwich structures to exert their mechanical/multifunctional advantages. The melt-reconstruction of thermoplastic resin provides a new choice for the facesheet/core connection of the thermoplastic composite sandwich structure (TPCSS), which can realize continuous and reliable facesheet/core interface without introducing new materials. This article summarizes the fusion bonding methods of thermoplastic composite sandwich structures in recent years. Common configurations and materials are summarized, and the main fusion bonding methods, including hot plate welding, compression molding, continuous hot pressing, facesheet/core co-weaving and additive manufacturing are reviewed and concluded. Based on the research and application status at home and abroad, the future development trend and application prospects of the fusion-bonded thermoplastic composite sandwich structure are prospected.