Titanate coupling agent was used to modify the surface of polyvinyl chloride (PVC), and recycled plastic concrete composites with different amounts of modified PVC filler were prepared to study the effects of filler content on the performance of the composites. The results show that recycled plastic concrete prepared with titanate coupling agent-modified PVC exhibits good mechanical properties, wear resistance, impermeability and durability. When the modified PVC filler content is 15%, the compressive strength and flexural strength of recycled plastic concrete are 32.21 MPa and 9.23 MPa, respectively. The average friction coefficient and unit area wear loss are 0.65 and 0.90 kg/m², respectively. The incorporation of titanate coupling agent-modified PVC effectively improves the impermeability of recycled plastic concrete. After 50 cycles of sulfuric acid resistance and freeze-thaw resistance tests, the compressive strength of recycled plastic concrete with 15% modified PVC filler shows the lowest decrease, with reduction rates of 11.95% and 7.42%, respectively. This indicates excellent corrosion resistance and freeze-thaw resistance. Recycled plastic concrete filled with titanate coupling agent-modified PVC exhibits good comprehensive performance, meeting the requirements for use in the construction industry.