The invention belongs to the technical field of automobile accessories and relates to an automobile cup holder inner liner buckle and a preparation method thereof. The preparation method comprises thefollowing steps: the nylon material is injected into a first injection mold to obtain a hard glue; The hard glue is placed in a modified polyphenylene ether solution, and the hard glue is left standing at 10-60 min, take out, drying to obtain modify polyphenylene ether treated hard glue; The treated hard glue is placed in a second injection mold, and a thermoplastic elastomer material is injectedon the surface of the hard glue to obtain an inner liner buckle.