Secondary injection molding technology has many advantages such as short process flow, low manufacturing cost, and high production efficiency. It is widely used in automobile manufacturing, consumer electronics, light industry, communications and other fields. Interface bonding strength is the key to affecting the quality of secondary injection molded products. This article summarized the research on the interface bonding strength of secondary injection molding at home and abroad in recent years, analyzed the influencing factors of interface bonding strength, and discussed the working principles, characteristics, advantages and disadvantages of different influencing factors, elaborated on the application of secondary injection molding in different fields, finally, the future development of secondary injection molding technology was prospected.