The invention discloses a broadband directional antenna based on a resonant reflector. The broadband directional antenna is mainly composed of a broadband antenna body layer, a resonant reflector layer and a director layer. The resonant reflector layer is arranged exactly below the broadband antenna body layer. The director layer is arranged exactly above the broadband antenna body layer. The broadband antenna body layer comprises a body dielectric substrate, and a main radiation patch and a metal loading ring which are adhered on the body dielectric substrate. The resonant reflector layer comprises a resonant dielectric substrate and a metal resonant ring which is adhered on the resonant dielectric substrate. The director layer comprises a directing dielectric substrate and a metal directing ring which is adhered on the directing dielectric substrate. A higher profile required by loading of a conventional metal reflecting board on the antenna is overcome, and larger area and narrower frequency band required by loading of an AMC structure on the antenna is also overcome so that the broadband directional antenna based on the resonant reflector has dual advantages.