Polarization imaging detection based on continuous terahertz (THz) wave is studied. THz real-time polarization imaging system,which using the SIFIR-50 THz laser as radiation source and a NEC IRV-T0831C THz imager as array detector, is demonstrated. According to the polarization characteristics from transmitted light of the target, THz transmission images for three kinds of typical targets—metallic structures, watermark of cashes and hidden objects—are obtained using the uncooled microbolometer THz camera. The Stokes vector images and polarization images are calculated and analyzed. Experimental results show that THz polarization imaging not only have the advantage of THz noninvasive imaging, but can also improve the performance of target recognition effectively and maximize the differences between the images of different target objects.