Based on current researches, the modification methods of bioplastic polyhydroxyalkanoates (PHAs) and the preparation technology of cellulose modified bioplastic PHAs composites were summarized. For each of the preparation process with cellulose modified bioplastic PHAs composites, the changes of different preparation methods on cellulose modified bioplastic PHAs composites structure and performance were analyzed in detail with the indication of the advantages and disadvantages of each preparation technology. Cellulose modified bioplastic PHAs composite packaging materials would be the focus of future research in the field of packaging. The realization of green production and further improving the performance of the composite material would be the key to achieving industrial production.