Microwave Sterilizer with an integrated Shredder, intended fo r treatment of Medical Waste in ho spitals and clinics. The device shall not be used for disposal of Infectious chemical wastes that require special treatment, or ganic materials, Blood and blood products, unrecognizable human body parts and partials of organ s remaining after surgery and other kind of medical treatment, laboratory and pathology examination materials, and particles of those (unless local country regulations allow it ) waste treatment automaton and automated waste treatment process. waste treatment automaton, in particular to trivialize waste from care activities with infectious risks, as well as a waste treatment process using that automaton automated waste treatment process, by means of an automaton as described above, and this automaton includes means for grinding waste of the type with a rotating blade, comprising the steps that consist of: a) introducing waste into the vat; b) crush the waste by rotating the blades at a given speed V1, and the crushing produces heat that heats the waste; c) emitting microwaves in the vat, mixing the residues by rotating the blade at a speed V3 below V1, to heat the residues and keep them at a disinfection temperature for a determined time; and d) evacuate waste from the waste.