The invention discloses a microwave high-power distribution/combination device. The microwave high-power distribution/combination device comprises a bottom plate and a cover plate; the bottom plate is covered with the cover plate; after the bottom plate is covered with the cover plate, the upper end surface of the cover plate is provided with three load ports, and the periphery of the cover plate is provided with five signal ports; the bottom plate includes a first magic H unit, a second magic H unit, a third magic H unit and a connecting block, wherein the connecting block is arranged among the three magic H units, and the four components are arranged in an gapless and integrated manner. According to the microwave high-power distribution/combination device of the invention, based on a microwave high-power capacity structure magic H, the three magic H units are combined together to form a structure shaped like a Chinese character "pin"; the magic H structure is fed into the same waveguide through two transmission lines connected together, so that branch line couplers which have two different work modes are coupled; after simulation optimization design and sample piece processing and debugging are performed on the parameters of the structure, the structure can be applied to a deep space exploration microwave high-power amplifier; and when the structure performs microwave power output, the air breakdown risk of cascaded filters can be lowered, and high-quality spectrum high-power microwave signals can be obtained.