Polarization is an intrinsic degree of freedom of light. The detection of polarization light provides more information in addition to light intensity and wavelength. Infrared polarization detectors play a vital role in numerous applications， such as imaging， communication， remote sensing， and cosmology. However， traditional polarization detection systems are bulky and complex， hindering the miniaturization and integration of polarization detection. Recently， the development of on-chip infrared polarization detectors has become an area of great interest. In this review， we focus on two recent advanced research areas of on-chip infrared polarization detectors： polarization-sensitive materials and integration of polarization-selective optical coupling structures. We discuss the current research status， future challenges and opportunities for the development of on-chip infrared polarization detectors.