Abstract: In order to solve the problems of high preparation cost, poor toughness and heat resistance of polylactic acid (PLA)-based wood-plastic composites, biodegradable resin polybutylene succinate (PBS) was used as a modified resin, which was blended with Salix powder (WF) and PLA to prepare environmentally friendly PBS-WF/PLA ternary degradable wood-plastic composites by compression molding. The results show that the addition of PBS can improve the toughness, heat resistance and thermal stability of the composites, but the strength and stiffness decrease. When the addition amount of PBS is 50wt% of the total resin, the comprehensive properties of PBS-WF/PLA composites are relatively better. Compared with WF/PLA, the production cost is reduced by about 20%. The retention rates of static bending strength, elastic modulus and tensile strength of PBS-WF/PLA are 86.5%, 63.8% and 73.1%, respectively. The impact strength is increased by 40.1%, and the Vicat softening temperature, thermal deformation temperature and the initial temperature of the second stage of thermal decomposition are increased by 37.1℃, 53.7℃ and 4.1℃, respectively.