A portable multi-nozzle air flow meter. A nozzle cover is attached to a front portion of a cylindrical housing. A nozzle panel is attached to an inner portion of the nozzle cover, with a central insertion hole being defined in a central portion thereof, such that a measuring nozzle is detachably inserted into the central insertion hole. The nozzle panel includes a sealing portion provided an inner peripheral portion of the central insertion hole. One or more fixed nozzles arranged in the nozzle panel in a circumferential direction about the measuring nozzle, such that a cross-sectional area thereof is adjustable depending on an amount of air flow discharged from a duct.