The present invention relates to a device for transferring a reinforcement ply (41, 42) having the general shape of a parallelogram and including reinforcement wires having ferromagnetic properties and defining a given angle b lower than 90 DEG relative to the longitudinal direction of said reinforcement ply, wherein the device includes at least two transfer belts (1, 2) vertically adjacent over a given length I and separated by a given distance having a low value, each of the belts including a magnetised area (12, 23) having a trapezoidal shape in which the bases are parallel to the longitudinal length of the belt and are intended for pressing the reinforcement ply against the mobile surface of said transfer belts.