For rigid dielectric substrate materials,it is difficult to bend conformally.In order to meet the application requirements of broadband,high polarization conversion ratio (PCR) and miniaturization of polarization converter,a dual broadband,high PCR flexible polarization conversion metasurface is proposed in this paper.The designed metasurface is composed of metal pattern layer,flexible dielectric layer and metal ground plate.The simulation results show that the metasurface can rotate the polarization direction of the linear polarization wave by 90° in the frequency bands of 8.52—13.35 GHz and 15.12—19.54 GHz. PCRs are 96.50% and 98.43%,and the corresponding relative bandwidths are 44.21% and 25.51%,respectively.The dual-band polarization conversion performance is manipulated by changing the thickness of flexible dielectric layer.The surface current at the resonant requency is simulated,and the mechanisms of dual-band and high PCR are analyzed. In addition,the dependence of PCR on incident angle and polarization mode of the metasurface are studied.The results show that the proposed metasurface has good dual-band polarization conversion performance and also has polarization insensitivity within 0° to 30°.The proposed dual-band flexible polarization conversion metasurface has great potentials in the application of electromagnetic wave polarization regulation.