The invention discloses a vehicle-mounted air purification humidifier, comprising a casing. The bottom end of the casing is in threaded connection with a bottom cover, the bottom end of the bottom cover is fixedly provided with a support column, the bottom end of the support column is fixedly provided with a strong suction cup, the top end of the casing is fixedly provided with a dustproof net, the casing is internally provided with a water storage tank, and an ultrasonic atomizer is arranged at the center of the top end of the water storage tank. According to the vehicle-mounted air purification humidifier, by arranging silent air-draft fans, air is sucked into the interior of the casing through a through hole in the bottom cover, air sequentially passes through a filter net, an activatedcarbon adsorption layer and a photocatalyst filter net, and is discharged through the dustproof net, air passes a baffle, to disperse the airflow, the air is easily purified, by arranging a water storage tank, a water solution can be stored, water in the water storage tank is subjected to the action of the ultrasonic atomizer to atomize the liquid and sprayed through an atomizing nozzle, therebyhumidifying the air and ensuring the cleanness and humid of the air in a vehicle body.