Coupling device (20) for a vertical pole (8) for gym exercises comprising a hemispherical element (3) positioned inside a seat (22), a base (1), a shaft (5) inserted inside the hemispherical element (3) to which the vertical pole (8) for gym exercises is connected, said device (20) being characterized in that the hemispherical element (3) comprises a plurality of blocking elements (10, 33, 45) configured to be coupled to a plurality of corresponding elements (26, 34, 44), made on the inner surface of the seat (22) of the hemispherical element (3) to prevent the rotation of the pole (8) around an axis (X) passing through the centre of the coupling device (20) while leaving free the oscillatory movement of the pole (8) with respect to said axis (X).