The invention relates to a medical infrared sterilizer which comprises an infrared heater, a radiator sleeve, a supporting tube and a base. The infrared heater is arranged on one side of the radiator sleeve and fixedly connected with the radiator sleeve, the supporting tube is arranged below the radiator sleeve, a protecting plate is arranged on the supporting tube and welded with the radiator sleeve, through holes are formed in the radiator sleeve, the supporting tube is fixedly connected with the base, a ceramic tube is arranged in the radiator sleeve, a metal tube is arranged in the ceramic tube, reflectors are arranged on the metal tube in an inclined manner and distributed on the metal tube in an equally spaced manner, the base is provided with connection holes and a power switch, the gap between the radiator sleeve and the ceramic tube ranges from 6.8mm to 8.7mm, and the thickness of the ceramic tube is larger than 2cm and smaller than 3cm. The medical infrared sterilizer is high in sterilizing efficiency, stable and reliable in structure, safe, reliable and fine in radiating effect.