The bottle sterilizer belongs to the tableware disinfection device, and functions to disinfect and sterilize the bottle used by the baby. Because milk powder contains substances such as protein and fat, these substances can easily breed bacteria. If the baby's tableware is not completely disinfected, the baby will cause vomiting and diarrhea after use. Conventional boiling water bottle disinfection methods can be fully disinfected, but the temperature and disinfection time are not easy to master. With the bottle sterilizer, the disinfection time and temperature can be easily controlled to liberate the parents' time.