Automatic cleaning and sterilizing machine

The utility model discloses an automatic cleaning sterilizer which comprises a sterilizer main body provided with a sterilizing chamber, the sterilizer main body is provided with a double-preheating system and a double-heating system, the double-preheating system is connected with a water delivery port of the sterilizer main body, and the double-preheating system is used for heating pure water to different temperatures and delivering the pure water into the sterilizing chamber; the double-heating system comprises a blower device, a first heating device and a second heating device, the first heating device is connected with the second heating device, the second heating device is communicated with the disinfection chamber, and the blower device is connected with the first heating device. The two-stage preheating system can heat pure water to different temperatures required by the sterilizer in advance and keep a constant-temperature state, so that the sterilizer can be conveniently used at any time, and the run