Waveguide cavity high-power load

The utility model provides a waveguide cavity high-power load. The waveguide cavity high-power load comprises a straight waveguide for introducing a microwave signal and a waveguide load cavity hermetically connected to a straight waveguide port. According to the invention, the aperture of the waveguide load cavity is set to be larger, and the aperture of the straight waveguide is set to be smaller, so that the end face, connected with the waveguide load cavity, of the straight waveguide is used for providing a step, the absorber is arranged between the end face of the straight waveguide and the closed end face of the waveguide load cavity in an abutting mode, and the absorber is prevented from falling off. As the size of the waveguide load cavity is set to be large, a larger heat dissipation area can be provided, and heat dissipation of the load is facilitated. Moreover, the load cavity can realize mode conversion directly through the straight waveguide, and can support the absorber by using the straight wav