1, hygiene is not up to standard, self-brewed wine cannot be disinfected, and a large number of harmful bacteria and viruses remain in the wine.

2. It is impossible to exclude methanol, and it is easy to cause methanol to exceed the standard. Homemade wine will produce a lot of methanol when it is fermented. Although it will make wine more intoxicating, it will do more harm than good to the human body.

3, unprofessional operation, homemade wine usually does not use professional brewing tools, so it is impossible to standardize the process, and the generated waste cannot be removed correctly, which is harmful to health.