A machine for sterilizing the topsoil of the ground, including the injection of superheated steam, includes a water tank (5) and elements for producing superheated steam and for conveying the latter to at least one supply nozzle (6). The elements for producing superheated steam include: a spraying unit (8) that is in communication with the water tank and that includes a spraying chamber (9) in which a spraying device (10) is disposed in order to form an aerosol of fine water particles in the chamber； a unit (11) which can generate a conveying airflow that is moved through the spraying chamber (9) so as to drive the prepared aerosol out of the chamber； and a heating unit (12) which can raise the temperature of the aerosol such that the latter is converted into steam.
