Salt water gargling to prevent the new crown virus is not true, although there is a certain role in cleaning the oral cavity, but no prevention and killing effect of the new crown virus. Salt water gargling is to use saline or self-prepared sodium chloride solution gargling, the use of salt water flushing effect, helps to remove part of the oral cavity, throat secretions, food, etc., but only in a short period of time to play a simple physical rinsing effect, for the new coronavirus and other pathogenic microorganisms have no preventive and elimination of the effects of the new coronavirus. Scientific prevention of the new coronavirus should be done on time, standardized, the whole process of vaccination of the new crown, improve health literacy, good personal protection, and develop good habits and lifestyles, such as wearing masks, “one-meter line”, washing hands frequently, and public chopsticks, etc., and do not believe in biased prescriptions and statements without scientific basis.