The invention discloses a medical respirator achieving aerosolization. The respirator comprises a respirator main body, an inner cavity of the respirator main body is internally provided with an oxygen supply device and an aerosolization box, the oxygen supply device comprises an air-oxygen mixer, and the air-oxygen mixer is communicated with an air pipeline, a pure oxygen pipeline and a mixed gaspipeline in sequence; an inner cavity of the aerosolization box is internally provided with a liquid medicine box, medicine delivery pipes are symmetrically communicated with the liquid medicine box,a compressed air blower is arranged on the liquid medicine box, a straight duct is communicated with an air outlet, the straight duct is communicated with a trapezoidal duct which is communicated with a thin duct, the symmetrical medicine delivery pipes and the thin duct are gathered and communicated, and an atomization mesh is arranged in the thin duct. According to the medical respirator achieving aerosolization, humidified gas moderate in air-oxygen ratio can be provided, for a patient needing aerosolization, the device can meet the requirements of oxygen inhalation and aerosolization of the patient simultaneously, equipment replacement is not needed, and convenience is brought to use.