The invention provides a portable pluggable air purifying device and relates to purifying equipment. The portable pluggable air purifying device comprises a USB plug, a hollow cylinder is arranged onthe USB plug, and an exhaust fan is arranged at the top of the hollow cylinder. A replaceable air purifying bag is arranged at the lower end of the exhaust fan, the exhaust fan is connected with the USB plug through a wire, and dense air holes are formed in the lower end of the hollow cylinder. The portable pluggable air purifying device has the beneficial effects that the design is novel, the structure is simple, air in a vehicle evenly passes through the air purifying bag through the effect of the exhaust fan, thus the air purifying effect is achieved, the manufacturing cost is low, and practicability is good.