Disclosed is a dual-layer antenna provided with T-shaped parasitic vibrator arms, said antenna comprising a first PCB and a second PCB stacked together. A top surface of the first PCB is provided with a first microstrip unit, the first microstrip unit comprising two symmetrically arranged microstrip vibration sets having the same shape. A top surface of the second PCB is provided with a second microstrip unit. When the first PCB and the second PCB are stacked, the second microstrip unit is located on the top surface of the second PCB and a bottom surface of the first PCB. Via an excellent dual-layer structural design and continuous testing and parameter adjustment, the present invention achieves excellent antenna performance and gain with good front-to-back ratio characteristics. The antenna has the features of a low profile, a wide band and a high gain. The 10dB impedance bandwidth of the antenna is 28.4%, and the average gain of a single antenna is 8.2dBi.