A novel design of X-band digital high-power phase shifter (PS) based on ferrite-circulator is presented. As verification of the presented design, a digital high-power ferrite-circulator-based PS of 180° is designed. Simulated results show that return losses and insertion losses are better than −22.87dB and −0.32dB at center frequency 9.25GHz, respectively. Results also indicate great consistency in both states. A power-handling capacity of 280kW is achieved under vacuum condition, and the switching time is within the level of microsecond. Moreover, the proposed structure is easily fabricated.