An active roll control device varies a position of a stabilizer link connecting a stabilizer bar with a suspension arm such that torsion rigidity of the stabilizer bar is varied to actively control the roll. A penetrating slot is formed in the suspension arm and may include a sliding unit that includes a rail plate disposed in a housing disposed at a lower side of the penetrating slot along a vehicle width direction and connects a connector that is movably disposed on the rail plate with a lower end of the stabilizer link to guide the stabilizer link along a width direction of the vehicle, and a drive unit having a lead screw as a rotation shaft through a three joint mounting portion that engages a screw connector connected to a hinge portion of the stabilizer link to transfer a driving torque to the stabilizer link.