The invention discloses a dual-band circular polarization planar printed antenna. An improved L-shaped microstrip structure, an inverted L-shaped loading pile and an impedance matching input feed line are printed on the upper surface of a dielectric substrate, and a metal ground that is loaded with an inverted L-shaped metal band and has an L-shaped groove and a rectangular groove is printed on the lower surface, through a certain layout, the dual-band circular polarization is realized, and the impedance bandwidth and circular polarization bandwidth can cover the frequency range of WLAN (2.4/5.2/5.8-GHz), the frequency range of Wi-Fi (2.4/5.5-GHz), and the frequency range of Bluetooth (2.5-GHz), and the frequency range of WiMAX (2.5/5.5-GHz) at the same time.