An air purifier housing comprises an outer cover and a bottom bracket with a center cavity which is open downwards and insertion grooves, recessing openings stretching into the center cavity are formed in side walls of the insertion grooves, insertion rods are fixed on the outer cover, which is inserted into the insertion grooves through the insertion rods; installation grooves corresponding to the recessing openings are in the insertion rods; and a limiting structure is in the center cavity and comprises a driving part and inner container protrusions which correspond to the recessing openings, and the driving part connects with the inner container protrusions and drives them to reach a first position where the inner container protrusions stretch out of the insertion grooves to be inserted into the installation grooves of the insertion rods or to reach a second position where the inner container protrusions retreat into the center cavity.