<p>Detection of circularly polarized light (CPL) is crucial for advancing next-generation chiral optoelectronic applications, where a large photocurrent dissymmetry factor (<i>g</i>_Iph) is essential for accurate polarization discrimination. Chiral hybrid perovskites (CHPs) have emerged as promising CPL-active materials owing to their intrinsic spin-orbit coupling and chiroptical properties. However, an intrinsic conflict between <i>g</i>_Iph and photocurrent response remains a major bottleneck in current CHP-based devices. Low-dimensional CHPs typically suffer from limited carrier mobility, while multilayered structures improve carrier transport but generally reduce the chiral component, thereby reducing chir-optical activity and <i>g</i>_Iph. Herein, we report Cs-based multilayered chiral-polar perovskite, (<i>R-β</i>-MPA)PACsPb₂Br₇ (1<i>R</i>, MPA=methylphenethylammonium and PA=propylammonium). The distinctive chiral-polar photovoltaic effect in 1<i>R</i> benefits spin-selective carrier separation and collection, and the resulting device achieves self-powered CPL detection with a high <i>g</i>_Iph of 0.5 and maintains excellent polarization selectivity even at ultralow light intensities of 62 nW cm⁻². Meanwhile, the multilayered framework enables high responsivity of 71 mA W⁻¹ and detectivity of 6×10¹² Jones (1 Jones=1 cm Hz^1/2 W⁻¹) even at zero bias. This work provides a rational design strategy to achieve chiral optoelectronic materials with a high dissymmetry factor and photocurrent response.</p>