Alcohol can kill the novel coronavirus, but it depends on the concentration of the different alcohols. Generally speaking, we apply 75% medical alcohol to kill the novel coronavirus very well. However, in hospitals or medical research, there is another alcohol concentration of 95%, which is very high but has a very limited effect on killing the virus because it can instantly denature the proteins on the surface of the virus, so that the alcohol can no longer enter the virus. Therefore, this alcohol can only be used as fuel, such as fuel for an alcohol lamp, and not as a disinfectant for disinfection. So when we kill the new coronavirus, we only need to use 75% alcohol concentration, too low or too high is not suitable.