The utility model provides an adjusting device of a high-power filter. The adjusting device comprises a fixed part, an adjusting part and a locking part, wherein the fixing part comprises a resonancerod fixing section, and one end of the resonance rod fixing section is fixedly connected to the cavity wall of the filter; the adjusting part comprises a resonance rod adjusting section, a bidirectional thrust ball bearing, a bearing fixing cover and an adjusting screw rod, the bidirectional thrust ball bearing is fixedly connected to one end of the resonance rod adjusting section, the bearing fixing cover abuts against the bidirectional thrust ball bearing, the adjusting screw rod is fixedly connected into an inner ring of the bidirectional thrust ball bearing, and the adjusting screw rod isin threaded connection with the resonance rod fixing section; the locking part comprises a locking nut, and the locking nut is rotationally connected to the adjusting screw. The utility model has theadvantages of simple structure, small occupied space and precise and accurate adjustment, effectively improves the debugging efficiency, and reduces the debugging labor cost.