Disclosed herein is an active air flap for vehicles, which includes a frame unit having a hollow structure in which horizontal and vertical frames thereof are connected to each other, and configured to fluidly communicate with an outside air inlet of a grill, a flap unit having a plurality of flap members rotatably connected to the frame unit and configured to open and close the outside air inlet, a drive unit configured to provide a driving force to the flap unit, and a link unit connected between the flap unit and the drive unit to transmit the driving force from the drive unit to the flap unit.