An active geometry control suspension system may include an active roll control unit having a guide rail formed along a predetermined distance in a front-rear direction from a rail seat inserted down from above a lower arm, sliders slidably fitting in the guide rail, a stabilizer link with one end pivotally coupled to the sliders, a pushrod with one end pivotally connected to the sliders, and an actuator having an operation bar, one end of which may be pivotally connected to the other end of the pushrod, the operating bar operating forward or backward, wherein the one end of the stabilizer link and the one end of the pushrod may be connected to the sliders through a double ball joint, and the other end of the pushrod and the one end of the operation bar may be connected through a ball joint.