An air PM2.5 purifier system comprising an airship 11. The system comprises an air purifying chamber 18 for receiving air with PM2.5 particles and a reagent solution for filtering PM2.5. The chamber has a mixing device 903 for mixing the air and the reagent solution. The system further comprises an air circulation system 902 for sucking air with PM2.5 into the air purifying chamber and discharging purified air, a reagent circulation system 904 for recycling the reagent solution, a reagent storage cavity 17 for storing clean reagent solution, and a particle storage cavity 15 for storing PM2.5 particles. A PM2.5 separation device 905 is disposed in separation cavity 16 for separating the PM2.5 particles from the reagent solution. The air circulation system may comprise a foam maker (35, Fig.2) in the air purifying chamber to create air bubbles in the reagent solution. The PM2.5 separation device may comprise a filter net (79), four auxiliary chain wheels (78), rotatable chains (53) rotatably disposed between the auxiliary chain wheels, and brushes (52) for cleaning walls of the separation cavity disposed on outer surfaces of the rotatable chains and for feeding PM2.5 particles into the particle storage cavity.
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