With the rising awareness of global consumers toward environmental protection, the world has initiated the plastic restricted policy successively and increased the demand for bioplastics. Polyhydroxyalkanoates (PHAs) is most similar to traditional petrochemical plastics in nature and is self-degradable in the natural environment. To date, the biosynthesis method of PHA is mainly based on microbial fermentation, but the process requires more carbon source supply, which leads to excessive production costs and thus limits its application. In view of this, in order to reduce the fermentation cost, we integrate the pretreatment and enzymatic hydrolysis technology of lignocellulose raw materials,and can effectively convert cellulose in waste paper containers into glucose, which can be used as a carbon source for the production of PHAs. The achievements above not only conform to the policy of circular economy but also have the benefits of industrial application.