In recent trends wood polymer composites (WPCs) have gained significant attention due to their sustainability and balanced mechanical performance, where as poor interfacial adhesion, bonding between hydrophilic wood fibers and hydrophobic polymer matrices often limits their properties strength. The coupling agent maleic anhydride grafted polyethylene (MAPE) is used as a compatibilizer to improve interfacial bonding in WPCs. This study examines the effect of MAPE on the physical, mechanical properties of WPCs. Even less percent of MAPE incorporation significantly enhances tensile strength, flexural strength, and impact resistance due to improved stress transfer between the wood fibers and polymer matrix. Scanning electron microscopy reveals reduced fiber pullout and better fiber dispersion in MAPE modified composites. MAPE reduces water absorption by enhancing interfacial compatibility. Hence, the use of MAPE as a coupling agent effectively enhances the properties and durability of WPCs, making them more suitable for structural and various practical applications.