The invention discloses a double-wave-beam slot array antenna, and belongs to the technical field of slot array antennae. The double-wave-beam slot array antenna aims to solve the problems that the number of antennae in a wireless bridge is overlarge and mutual interference exists due to the fact that an existing slot antenna only has a single frequency characteristic. The double-wave-beam slot array antenna comprises a PCB, the PCB is formed by a surficial layer, a middle layer and a bottom layer, the surficial layer of the PCB is evenly divided into four small sections, a first section and a third section are respectively provided with 90-degree annular slots with the radiuses of r1, r1+h, r1+2h,... r1+nh, and a second section and a fourth section are respectively provided with 90-degree annular slots with the radiuses of r2, r2+h, r2+2h,... r2+nh. A central coaxial feed mode is adopted by the feed source of the slot antenna, the inner conductor of the center of a coaxial SMA connector is connected with the surficial layer of the PCB, and the outer conductor of the coaxial SMA connector is connected with the bottom layer of the PCB. The double-wave-beam slot array antenna is used as a slot array antenna.