The utility model relates to an air purifier, the concrete positioning mobile air purifier that is, including installing the spiral track at indoor top, it has a plurality of environmental monitoring wares to distribute on the spiral track, and air purifier passes through drive arrangement and installs on the spiral track, installs distance measurement signal transmitter on air purifier and every environmental monitoring ware respectively, and spiral track center installs the position information and accepts the center, and the signal that each distance measurement signal transmitter was accepted at the center is accepted to information, and information acceptance center, environmental monitoring ware, air purifier are connected with control system respectively. This positioning mobile air purifier, the room air that is applicable to great space is evolved, can carry out the orbital shape of adjusted spiral according to indoor shape, monitors indoor multiple spot, has corresponding to carry out air purification to the region that the air quality is not good and handles, control method and removal simple structure.