The current blind element detection of infrared polarization detectors mainly relies on the discrimination method in GB/T 17444-2013, which ignores the statistical analysis of abnormal elements that cannot respond properly to polarized light. These elements cannot be eliminated by national standards, which seriously affects the imaging quality. Therefore, it is necessary to add a polarization blind element detection method on top of the original blind element detection method, so as to more accurately evaluate the blind element of polarization infrared detectors. A method for obtaining polarization blind elements through extinction ratio testing based on electric polarizers has been proposed, which can greatly reduce the testing error caused by internal polarization angle etching. At the same time, it can achieve multi-dimensional simultaneous detection of polarization blind elements of polarization devices, conventional overheated elements, and dead elements. Experimental verification is carried out using the 320×256 detector developed by our company. The number of blind elements identified using national standards is 1010. After introducing polarization blind elements, the number of blind elements is 1178; The overall number of blind elements increased by 0.2% compared to using the national standard discrimination method.