The invention discloses a high-efficiency trimming device for an aero titanium alloy support seat. The high-efficiency trimming device for the aero titanium alloy support seat comprises a working table, two rotary plates, trimming frames, a seat conveying table and a swinging and feeding frame, wherein the two rotary plates are symmetrically arranged on two sides of the upper end surface of the working table; a perpendicular L-shaped installation plate is arranged on the upper part of the middle part of the working table; a rail plate is horizontally arranged above the installation plate; andthe trimming frames matched with the rotary plates are arranged at two ends of the rail plate. The high-efficiency trimming device for the aero titanium alloy support seat provided by the invention has the beneficial effects that cross-shaped rotary frames on the rotary plates rotate to drive multiple rotary trimming seats to rotate anticlockwise so as to trim a seat body, so that the efficiency on trimming the seat body through the device is improved; the rotary plates and the rotary frames are matched in different rotation direction so as to carry out trimming operation, so that the probability of contacting the rotary trimming seats and grinding sheets on the rotary frames is increased, and the device can be used for sufficiently and comprehensively trimming the seat body; and a sleeveplate is used for clamping, stopping and sleeving a hydraulic rod, so that the hydraulic rod moves up and down stably and firmly, and the seat body is ensured to be stable when being swung, fed and moved.