Locking test fixing tool for self-locking nut

A locking test fixing tool for a self-locking nut comprises a base, a mounting seat and a plurality of connecting pieces, and the base and the mounting seat are detachably and fixedly connected through the connecting pieces; the base comprises a clamping column with the cross section in a regular polygon shape, a first mounting plate is fixed to one end of the clamping column, and first assembly holes corresponding to the connecting pieces one to one are formed in the first mounting plate. The mounting seat comprises a mounting column, a processing hole with a T-shaped cross section is formed in the middle of the mounting column, the processing hole comprises a first hole and a second hole, the aperture of the first hole is larger than that of the second hole, and a plurality of key grooves capable of being matched with keys of the self-locking nut to be detected are formed in the inner wall of the second hole in the circumferential direction; second assembly holes in one-to-one correspondence with the first