To obtain a faster rate of polarization imaging detection, this study has improved the existing mechanical rotary polarization imaging device and designed a continuously rotating polarizer imaging device. Image processing flow and polarization imaging speed were also improved. This device overcomes the shortcomings of traditional mechanical rotating polarization imaging with a large volume and slow imaging speed. The system uses a motor to control the polarizer to rotate quickly and smoothly, the camera to work synchronously for the quick acquisition of the polarized image. Simultaneously, the polarization image is pipelined to achieve a higher polarization image acquisition rate, and each three adjacent intensity diagrams are used to calculate the polarization image which resulted in the same imaging rate of polarization image and intensity image. Experiments show that the device has good working stability and can complete the acquisition of polarized images well. Moreover, it can obtain polarization information through the polarization and polarization angle with an average acquisition time of 0.033 s. This work improves the detection speed of the mechanical rotary polarization imager and enables the enhancement of the mechanical polarization imaging speed and achievement of the basis of detecting moving targets.