Abstract: A type of high power single-pole multi-throw wave-guide switch is designed in this paper. Combining technologies of high power wave-guide rotary joint with traditional electric wave-guide switch, high power channel switch between input and N-way output is realized, thus the multiple traditional single-pole double-throw switch are replaced with one single-pole multi-throw switch. The switch has simple structure, convenient and flexible driving, greatly reduced volume, weight and cost and better reliability. During the switching rotation, the switch carries high power but has low insertion loss and low VSWR. A sample switch is produced, the experiment results verifiy the feasibility of the design.