Benzalkonium bromide is ineffective against novel coronavirus. Benzalkonium bromide is a cationic disinfectant and can be used as a disinfectant and antiseptic in pharmaceuticals, cosmetics, and water treatment for sterilization and disinfection. It can also be used as non-oxidizing bactericidal and algaecide as well as slime stripper and cleaning agent, which has the functions of cleaning, poisoning, eliminating and algaecide. As a water injection biocide in the oilfield, it has excellent bactericidal and decontamination power, and has no corrosive effect on metals. Since it is a non-chlorine toxicicide, it is far less effective than chlorine-containing disinfectants for the elimination of new coronaviruses, so benzalkonium bromide cannot be used as a disinfectant for the elimination of new coronaviruses.