The invention provides a crack double-waveguide antenna which is characterized in that the crack double-waveguide antenna comprises two waveguide tubes which are fixedly connected through any two sides and are respectively used for transmitting electromagnetic wave signals of different frequencies, and crack sets which are arranged on two adjacent sides of the two waveguide tubes and include a first set of cracks arranged on one side and a second set of cracks arranged on the other side, wherein the polarization direction of the first set of cracks is parallel to the length direction of the waveguide tubes, and the polarization direction of the second set of cracks is perpendicular to the length direction of the waveguide tubes. Because of a high degree of isolation between crack double-waveguide antennas, the channel correlation of signals can approach 0 when the signals are transmitted or receiving using the crack double-waveguide antennas. Therefore, the crack double-waveguide antenna of the invention has the advantages of small signal attenuation and strong anti-interference capability. In addition, the crack double-waveguide antenna can well support the MIMO technology and save space resources.