Waveguide isolator

The utility model discloses a waveguide isolator which comprises an upper waveguide cover plate and a lower waveguide cavity which are fixedly connected with each other. The lower waveguide cavity comprises a first cavity, a second cavity and a third cavity; one end of the first cavity, one end of the second cavity and one end of the third cavity are connected, so that the first cavity, the second cavity and the third cavity form a communicating cavity; the other end of the first cavity is open and serves as an output port of the waveguide isolator. The other end of the second cavity is connected with a waveguide input cavity, one end of the waveguide input cavity is connected with the communicating cavity, and the other end of the waveguide input cavity is open and serves as a waveguide input port of the waveguide isolator; and the other end of the third cavity is opened as a load port of the waveguide isolator. According to the utility model, signal interference can be prevented, and the application require