A machine for the treatment of medical hazard waste; the machine comprises: a cylindrical containing body, which is mounted so as to rotate around a first rotation axis and inside which a treatment chamber is defined; a first actuating device, apt to rotate the containing body around the first rotation axis; an inlet/outlet opening, which is obtained through a lateral wall of the containing body and is provided with a mobile lid; and a vapour feeding device, which is apt to feed vapour under pressure into the treatment chamber; the machine is characterised in that it comprises: at least a pushing element, which is arranged inside the treatment chamber, projects from an inner wall of the containing body, and is integral to the containing body so as to rotate around the first rotation axis together with the containing body, in order to push the waste arranged inside the treatment chamber from the bottom to the top; a shredding device, which is arranged inside the treatment chamber in a fixed position, so that the containing body rotates around the shredding device; a conveying device, which is arranged inside the treatment chamber and above the shredding device in a fixed position, so that the containing body rotates around the conveying device; and a vacuum device, which is pneumatically connected to the treatment chamber, so as to create a vacuum inside the treatment chamber. a cylindrical containing body, which is mounted so as to rotate around a first rotation axis and inside which a treatment chamber is defined; a first actuating device, apt to rotate the containing body around the first rotation axis; an inlet/outlet opening, which is obtained through a lateral wall of the containing body and is provided with a mobile lid; and a vapour feeding device, which is apt to feed vapour under pressure into the treatment chamber; the machine is characterised in that it comprises: at least a pushing element, which is arranged inside the treatment chamber, projects from an inner wall of the containing body, and is integral to the containing body so as to rotate around the first rotation axis together with the containing body, in order to push the waste arranged inside the treatment chamber from the bottom to the top; a shredding device, which is arranged inside the treatment chamber in a fixed position, so that the containing body rotates around the shredding device; a conveying device, which is arranged inside the treatment chamber and above the shredding device in a fixed position, so that the containing body rotates around the conveying device; and a vacuum device, which is pneumatically connected to the treatment chamber, so as to create a vacuum inside the treatment chamber. at least a pushing element, which is arranged inside the treatment chamber, projects from an inner wall of the containing body, and is integral to the containing body so as to rotate around the first rotation axis together with the containing body, in order to push the waste arranged inside the treatment chamber from the bottom to the top; a shredding device, which is arranged inside the treatment chamber in a fixed position, so that the containing body rotates around the shredding device; a conveying device, which is arranged inside the treatment chamber and above the shredding device in a fixed position, so that the containing body rotates around the conveying device; and a vacuum device, which is pneumatically connected to the treatment chamber, so as to create a vacuum inside the treatment chamber.