The invention relates to an infrared polarization sensor. The infrared polarization sensor is manufactured based on an MEMS (micro-electromechanical system) processing technology. The infrared polarization sensor comprises a detection waveguide, an annular resonant cavity waveguide and a thermo-sensitive micro suspension arm. The infrared polarization sensor is characterized in that an infrared polarizer is integrated on the thermo-sensitive micro suspension arm; the infrared polarizer receives natural infrared light and outputs polarization infrared light to the thermo-sensitive micro suspension arm integrated with the infrared polarizer, so that the thermo-sensitive micro suspension arm undergoes thermal bending deformation, and therefore, the amplitude and frequency of detection light and excitation light which are transmitted in the annular resonant waveguide drift. An infrared polarization filter array is combined with an MEMS structure, so that infrared detection signals are converted into visible light or near infrared light signal intensity or frequency change; infrared polarization light detection can be realized with no expensive infrared thermo-sensitive materials or down-conversion materials used. The infrared polarization sensor has the advantages of low cost, high sensitivity and the like.