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In this article, through the optimized arrangement of the magnetized plasma, dielectric, and nonlinear Kerr dielectric, a tunable reflection phase retarder with a certain bandwidth is investigated. When the electric field of the incident electromagnetic wave is parallel to the xoy plane and has an angle of 45° with the x‐axis, the electric field can be further decomposed into Ex and Ey along the x‐ and y‐axes, indicating TM and TE waves, respectively. The results show that under reasonable parameters, the 180° or −180° phase delay of the reflected wave of the proposed structure is obtained and adjusted. In particular, the nonlinear bistable response at this performance is also demonstrated. Furthermore, to verify the superiority of the obtained bandwidth of the phase retarder, the influences of the incident angle, the plasma frequency, the external magnetic field, and the nonlinear light intensity on the bandwidth of the phase retarder have been studied. It is observed that the total phase retarder bandwidth can reach 2.6 GHz by appropriately optimizing those parameters. Additionally, this work provides constructive suggestions for tunable broadband phase blockers and half‐wave plates, and it still holds some potential significance in the radome. [ABSTRACT FROM AUTHOR]