The work aims to review the research progress of poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) modification at home and abroad in recent years to provide a scientific theoretical basis for the further development of PHBV application in the packaging field. Based on the advantages and disadvantages of PHBV film materials, the physical and chemical modification of PHBV were discussed. PHBV was a kind of thermoplastic resin with biodegradability and had broad application prospects. However, PHBV had high brittleness and poor toughness, and must be modified and both physical and chemical modification had advantages and disadvantages. Numerous studies have shown that the properties of PHBV have improved after modification, but the performance of composites is limited due to poor compatibility. Therefore, it is necessary to develop and improve modification technology that does not sacrifice biodegradability of materials but has simple process, and low cost.