A modular and portable air purifier which solves the size and mobility problems of traditional air purifiers. It can be installed on curtain rods, saving space. The air outlets can be adjusted freely to circulate air. When the purifier detects that the air quality in the room is lower than health requirements, the air purifier automatically begins purifying the air to create a healthy and comfortable living environment. All functions can be controlled by a Wi-Fi enabled mobile device.