Disclosed is an active hood hinge device for vehicles. The active hood hinge device includes an actuator bracket rotatably coupled to a mounting bracket of a vehicle body at one side, a locking lever rotatably coupled to the actuator bracket and driven by an operating force of an actuator, a long link rotatably coupled to the actuator bracket, and unfolded and rotated from the actuator bracket by a rotating force of the locking lever, and a hood bracket rotatably coupled with the long link and fixedly coupled to a hood panel at opposite sides.