The invention discloses a directional dual-frequency antenna. The directional dual-frequency antenna comprises an irradiator, a microstrip Balun, a first transmission line, a second transmission line and a reflective plate, wherein the irradiator is provided with a groove, a gap and a bent part, the inner end of the gap is connected with the groove, the outer end of the gap is opened, a first edge of the bent part is connected with a first edge of the gap, and a second edge of the bent part is connected with a second edge of the gap; a first end of the first transmission line is connected with the irradiator, a second end of the first transmission line is connected with the microstrip Balun, and a first end of the second transmission line is connected with the irradiator; and the reflective plate is arranged below the irradiator, separated from the irradiator and connected with the microstrip Balun. According to the embodiment of the invention, the directional dual-frequency antenna has the advantages of ultra wide band, high gain, high front-to-back ratio, high axial cross polarization ratio, good consistency in directional diagram, small volume, simple structure, low manufacturing cost and the like, and is convenient to process.