A link structure of a power tailgate is disclosed in which the links opening and closing the tailgate move perpendicularly in relation to the rotational direction of the driving motor, thereby preventing an overload of the motor. Accordingly, a small capacity motor may be used for reducing the weight and raw material cost thereof. Further, as the orientation of the links is in the longitudinal direction of the vehicle body, a compact link construction is provided. Such the structure includes a rack gear meshing with a driving gear of the motor, and a multi-joint link connected at both ends thereof to the rack gear and tailgate, respectively. The multi-joint link is constituted by a plurality of link members relatively and pivotally connected to each other by means of pins.