A method for treating and recycling cuttings from earthworks, making it possible to obtain a comminution composed of a mixture of materials coming from said cuttings with at least one additive, and comprising at least the steps consisting in: - regularly extracting from a hopper a volume of materials, in such a way as to form a stream of materials, this stream being conveyed in one direction to an enclosure disposed downstream of the hopper; - introducing this stream of materials into the enclosure gradually, under gravity; - adding to the materials located in the enclosure an additive, which is also introduced into the enclosure gradually, under gravity; - grinding the materials and mixing them with the additive, by means of a bladed rotor having an axis of rotation perpendicular to the direction in which the stream of materials is conveyed from the hopper to the enclosure as well as to the direction of introduction, under gravity, of the stream of materials into the enclosure, characterized in that - the grinding and mixing are now done while permanently maintaining in the enclosure a filling level of materials in which said bladed rotor lies, the direction of rotation of the bladed rotor being configured to carry and cast against an inner wall of the enclosure the stream of materials falling into said enclosure, in a direction opposite to the conveying direction, the materials ground with the additive being then stirred several times, in particular because a constant filling level is maintained in the enclosure, said materials being cast against the inner wall of the enclosure once again, which refines the grinding and mixing, - the mixture is gradually evacuated through an opening in the downstream lower part of the enclosure, the rotation of the rotor allowing the evacuation of the mixture through said opening. - regularly extracting from a hopper a volume of materials, in such a way as to form a stream of materials, this stream being conveyed in one direction to an enclosure disposed downstream of the hopper; - introducing this stream of materials into the enclosure gradually, under gravity; - adding to the materials located in the enclosure an additive, which is also introduced into the enclosure gradually, under gravity; - grinding the materials and mixing them with the additive, by means of a bladed rotor having an axis of rotation perpendicular to the direction in which the stream of materials is conveyed from the hopper to the enclosure as well as to the direction of introduction, under gravity, of the stream of materials into the enclosure, characterized in that - the grinding and mixing are now done while permanently maintaining in the enclosure a filling level of materials in which said bladed rotor lies, the direction of rotation of the bladed rotor being configured to carry and cast against an inner wall of the enclosure the stream of materials falling into said enclosure, in a direction opposite to the conveying direction, the materials ground with the additive being then stirred several times, in particular because a constant filling level is maintained in the enclosure, said materials being cast against the inner wall of the enclosure once again, which refines the grinding and mixing, - the mixture is gradually evacuated through an opening in the downstream lower part of the enclosure, the rotation of the rotor allowing the evacuation of the mixture through said opening.