Abstract: In the context of global energy structure transformation, the efficiency improvement of alkaline water electrolysis (AWE) technology urgently needs to break through the performance bottleneck of the separator material. To address the problems of high surface resistance and low ion conductivity of polyphenylene sulfide (PPS) separators, this paper developed a paper-based composite separator based on wet nonwoven technology and coated with a PVA composite layer. The results showed that the structural regulation enhances the fiber bonding force through aramid pulp, increasing the tensile strength of the base paper to 5.6 MPa, providing stable support for the functional layer. Based on this, the developed composite separator PPS70@PVA had a minimum surface resistance of 146 mΩ·cm² under simulated industrial conditions of 80℃ and 30wt% KOH electrolyte, with an ion conductivity of 205 mS·cm⁻¹. After continuous operation at a current density of 500 mA·cm⁻² for 168 hours, its performance showed no degradation, confirming its excellent stability under simulated industrial conditions. These results highlight the potential of this composite separator in addressing the key bottlenecks of the AWE system, aligning with the goal of high energy efficiency.