Fastening device for coupling ploughing elements in agricultural cultivation machines, said ploughing elements (3) include ploughshares, points, blades or any similar type of tool, characterised in that it comprises an intermediate fastening element (2), formed by a robust body, which joins the ploughing element (3) to the support arm said intermediate fastening element (2) is equipped with fastening means (1) for linking thereof to the support arm guiding means (4) for insertion of the former inside the ploughing element (3) and an aperture (5), passable transversely with respect to the direction of the guiding means (4) intended for insertion of an extractable bolt (6) which, in insertion position for said bolt (6), acts as a retaining element for the ploughing element (3) with respect to the intermediate fastening element (2). Said arrangement enables the user/operator to manually replace or reposition the ploughing element, avoiding any need for accessory tools for this purpose.
