The polarization properties of light are widely applied in imaging, communications, materials analysis, and life sciences. Various methods have been developed that can measure the polarization information of a target However, conventional polarization detection systems are often bulky and complex, limiting their potential for broader applications. To address the challenges of miniaturization, integrated polarization detectors have been extensively explored in recent years, achieving significant advancements in performance and functionality. In this review, we focus mainly on integrated polarization detectors with innovative features, including infinitely high polarization discrimination, ultrahigh sensitivity to polarization state change, full Stokes parameters measurement, and simultaneous perception of polarization and other key properties of light. Lastly, we discuss the opportunities and challenges for the future development of integrated polarization photodetectors.