Abstract: Matrix composites based on advanced epoxy resins have excellent properties, such as low density, high strength, high temperature resistance and impact resistance, and are widely used in aerospace, weapon equipment and wind energy industry. However, epoxy resins with three-dimensional cross-linked network structures are insoluble and difficult to be reprocessed and reused, which causes environmental pollution, and loss of expensive high-performance fibers in composite materials. Dynamic covalent chemistry becomes one of the preferred schemes for the design and preparation of degradable thermosetting resins. In this paper, degradation mechanism, preparation methods, performance characteristics and application development of degradable epoxy resins based on Schiff bond, hexahydro-triazine bond, acetal/ketal bond, D-A addition reaction, disulfide bond are systematically illustrated. Research status of degradable epoxy resin composites is described and the prospects are discussed.