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Although hydrophobic interface regions adjacent to water droplets play a vital role in microemulsion-based studies,their widespread applications have not been explicitly evoked owing to their small spaces.Herein,we designed and syn-thesized a novel double-tailed anionic surfactant(TPE-di-C8SS)by linking the propeller-shaped tetraphenylethylene(TPE)with two oc-tyl chains and an anionic sulfonate headgroup through a methoxy-butyl spacer.The extra spacer and steric hindrance between rigid TPE groups can create the large cavities in hydrophobic interface re-gions,which we call the hydrophobic interface cages(HICs).The po-tentials and advantages of HICs in the easily-prepared TPE-di-C8SS microemulsion have been implemented by comparing the extraction efficiency towards cationic rhodamine B with Aerosol OT(AOT)mi-croemulsion.The results provided solid evidence that HICs rather than water droplets contributed to a higher extraction efficiency.This work not only proposes a concept of HICs but also provides a new perspective of their utilization in microemulsion-based applica-tions.