An air disinfection device aimed at improving the efficiency and quality of air disinfection or sterilization may be achieved through an air disinfection device comprising a body housing a power supply and control unit, which, in turn, comprises an energy storage capacitor, a high-voltage constant current source, an ignition pulse generator, a ferrite-core pulse transformer, and a program control unit. The air disinfection device may also comprise an ultra-violet radiation source in the form of a pulsed gas-discharge lamp mounted on the body and enclosed in a tubular quartz casing. Given that the energy storage capacitor and the pulsed gas-discharge lamp may form a discharge circuit connected to the ignition pulse generator through the ferrite-core pulse transformer, the pulsed gas-discharge lamp may be placed in a bactericidal radiation translucent casing, resulting in convection air-cooling due to a natural draft inside the casing that disinfects and sterilizes surrounding air.