Benzalkonium chloride can effectively kill coronavirus. Current research has found that the new coronavirus is sensitive to heat and ultraviolet light, and 75% medical alcohol, 56°C for 30 minutes, ether, chlorinated disinfectants, peroxyacetic acid, chloroform and other lipid solvents and disinfectants can effectively inactivate coronavirus. Benzalkonium chloride is a quaternary disinfectant and is widely used for disinfection of medical devices, wound disinfection, cleaning and disinfection of the environment. The application of benzalkonium chloride needs to be used according to the instructions. Benzalkonium chloride is corrosive and irritating like most disinfectants containing chlorine, so it is best to wear gloves and a mask when using it to avoid burning the skin and respiratory mucosa.