The inadequate recycling rate of waste polyester textiles (PET) is a significant issue that needs to be addressed. This paper proposes PET/polypropylene (PP) composite boards as a more effective approach to achieving the efficient recovery of waste PET textiles. The study investigates the mechanical, hydrophilic, and thermal conductivity properties to explore its potential as a furniture board. The addition of PET enhances the mechanical properties and insulation performance of the composite boards. The chemical structure, crystalline structure, and hydrophilicity of PP remain unchanged. Furthermore, the color on the surface of the boards is uniform. Compared with common furniture materials available on the market, these composite boards exhibit superior mechanical properties, making them suitable for use as furniture boards.