The utility model discloses a flexible thin wall bearing special fixture, including parallel jaw, the free anchor clamps body, installation axle subassembly, an installation subassembly includes blind rivet, the bearing installation body and flexible thin wall bearing clamping device, and the bearing installation body includes an axle form main part, and the front portion of axle form main part is provided with oval axle journal, and the rear portion sets up cone part, and the blind rivet connection sets up and is in cone part's end, flexible thin wall bearing clamping device sets up oval axle journal both sides, the free anchor clamps bodies is including anchor clamps layer board, anchor clamps and guiding axle, and anchor clamps that the anchor clamps layer board set up including the symmetry move layer board and the quiet layer board of anchor clamps, and anchor clamps move anchor clamps and quiet anchor clamps including the symmetry setting, and move anchor clamps and quiet anchor clamps are connected through the guiding axle, surrounds ovalisation centre gripping hole. The utility model discloses a with pack into the oval axle journal of the bearing installation body of flexible thin wall bearing, the difficult problem of the difficult oval axle journal assembly with the bearing installation body of flexible thin wall bearing's round inner ring has been overcome.