Abstract: Polyvinyl butyral (PVB) resin has excellent film-forming properties, optical transparency, strong flexibility, elasticity, adhesion, and impact resistance. It is widely used in ceramic flower paper, coatings, adhesives, automotive windshield interlayer materials, solar cell packaging materials, and other fields. However, PVB exhibits non degradable characteristics, and the production of a large amount of waste PVB resin is prone to resource waste and environmental pollution. How to achieve the recovery and reuse of waste PVB resin is a research hotspot in the current engineering field. This article briefly introduces the characteristics of PVB resin and the sources of waste PVB resin, elaborates on the recycling technology of waste PVB resin, and provides examples of the application status of regenerated PVB resin in filtration materials, adsorption materials, toughening materials, foaming materials, and electrochemical materials. The review provides a reference for the recycling and reuse of waste PVB resin.