Host-guest molecular recognition at the liquid-liquid interface endows the interface with unique properties,including stimuli-responsiveness and self-regulation,due to the dynamic and reversible nature of non-covalent interactions.Increasing research efforts have been put into the preparation of supramolecular interfacial systems such as films and microcapsules by integrating functional compo-nents(e.g.,colloidal particles,polymers)at the interface,providing tremendous opportunities in the areas of encapsulation,delivery vehicles,and biphasic reaction systems.In this review,we summarize recent progress in supramolecular interfacial systems assembled by host-guest chemistry,and provide an overview of the fabrication process,functions,and promising applications of the resultant constructs.