Vehicle-mounted air purifier

The utility model provides a vehicle-mounted air purifier which comprises a cylindrical shell, an air outlet is fixedly formed in the upper end of the shell, a start button is arranged in the middle of the air outlet, and a battery is fixedly assembled at the lower end of the shell. A circuit board, a negative ion generating unit, an air quality sensor, an LED ultraviolet lamp, a supporting frame,a fan, a photocatalyst unit and a filter screen unit are arranged in the shell, and the air quality sensor, the negative ion generating unit, the LED ultraviolet lamp, the fan and the battery are allelectrically connected with the circuit board. The vehicle-mounted air purifier is diversified in function, and can adsorb harmful chemical substances in air in a vehicle, remove peculiar smell, filter dust, kill viruses and bacteria and the like at the same time; the air purifier is compact in structure and convenient to use, the filter screen unit can be replaced, and the purpose of long-term use of the purifier is achi