Abstract: In order to solve the problems of polarization zonal distribution of optical state of polarization (SOP) in the output light of wedge-shaped depolarizer, an optical crystal depolarizer with high disorderly distribution of SOP on the cross section of output light was designed and built. The optical crystal depolarizer combined many more crystal slope structures and optical axes to make the polarization change in light plane and to improve depolarizing efficiency. The simulation and experiments showed that the polarization zonal distribution of output light was weaken obviously and the uniformity of depolarization was improved on the transverse plane of light. The more intricately both crystal slope structures and optical axes were combined, the more disorderly the polarization distribution of the depolarizer would be, and the better the depolarization effect would be.