Micro air pump

The utility model discloses a micro air pump, which comprises a driving unit, an air flow control unit, a piston unit, a valve seat and a cover body, wherein the air flow control unit is driven by the driving unit to absorb or discharge air, and at least comprises a piston fixed seat, the piston fixed seat is provided with at least a first air inlet channel, the piston unit is arranged on the piston fixed seat, and is provided with at least an air cylinder portion, the valve seat is arranged on the piston unit, the valve seat is provided with at least a first air outlet through hole which is respectively faced to the corresponding air cylinder portions, the piston fixed seat, the piston unit and the valve seat commonly form a closed air storage chamber, the cover body is arranged on the valve seat, an air outlet cavity is commonly limited by the cover body and the valve seat, an exhaust pipe is arranged on the cover body, and is communicated with the air outlet cavity, and the inner diameter of the exhaust pipe is between 0.3mm and 0.6mm. The micro air pump can effectively reduce work noise by arranging the inner diameter of the exhaust pipe between 0.3mm and 0.6mm.