The sterilization process of colonoscopy is a very complicated process. The cleaning of colonoscopy needs to go through several stages: firstly, the used colonoscopy is cleaned with water first, the dirt will be washed off most of the time by rinsing with water; secondly, it undergoes enzyme washing, i.e., an enzyme is added into the laundry detergent, which is a kind of enzyme that has sufficient dissolving effect on the human body’s proteins, cells as well as other substances, after which it needs to be rinsed with water; then it is put into an automatic disinfecting machine, which is equipped with a stipulated pipeline brush. Then it is put into the automatic sterilizer, which is equipped with the specified pipe brush to clean the pipes of the rinsing pipe and the suction pipe; then it has to be enzymatically washed for the second time, and finally it is put into the sterilizer again. The whole process takes about 4-5 times of different forms of disinfection, and is also blown dry by a high-pressure air gun. The disinfection is so clean that it does not lead to the spread of diseases, and there is no dirt, so the colonoscopy is sterilized very thoroughly.