The invention relates to a device for adjusting the centring of a turbo-engine pivoting vane control ring, comprising a control ring (26) centred on a longitudinal axis (X-X) of the turbo-engine and provided with a plurality of tapped holes (36) running in a radial direction and a plurality of pad holders (32), each comprising a threaded rod (34) screwed into one of the ring's tapped holes (36), each pad holder (32) holding, at an inner end, a pad (30) intended to come into contact with a cylindrical shell (28), coaxial with the ring. The control ring (26) comprises, in addition, a plurality of slots (38) running in a tangential direction, each slot (38) communicating with one of the ring's tapped holes (36) The device comprises means (40, 42a, 42b) of pinching, in a longitudinal direction, each of the slots (38) in such a way as to lock the pad holders (32) in position.