In order to reduce multipath loss and anti-polarization mismatch, and meet the multi-band needs of wireless devices, a dualband circularly polarized antenna loaded with polarization torsional artificial magnetic conductors is designed. The polarization torsion artificial magnetic conductor adopts a double-layer structure to increase the phase response, uses a rectangular ring to extend the current path, and adds rounded corners and truncated rectangular patches to the rectangular ring which can cause surface impedance imbalance, and achieve efficient polarization conversion in the 2. 45 GHz and 5. 8 GHz bands. A polarization torsion artificial magnetic conductor is applied under the dual-band monopole antenna. By using the 90° polarization rotation effect achieve left-handed circular polarization in low-frequency bands and right-handed circular polarization in high-frequency frequencies. The simulation and experimental results show that the working bandwidth of the designed antenna is 2. 2 ~ 2. 58 GHz and 3. 5 ~ 6 GHz, the 3 dB axial ratio bandwidth is 2. 3 ~ 2. 56 GHz and 5. 6~ 6. 2 GHz, respectively, and the peak gain is 16. 8 and 7. 5 dBic, respectively. Experimental results confirm that the use of polarization torsion artificial magnetic conductors can reduce the complexity of dual-frequency circularly polarized antenna.