An ADAS-linked active hood apparatus for always-on operation is provided. The apparatus includes a hinge arm that is connected to a hood of a vehicle, a stationary bracket that is fixed to a vehicle body, and a rotary bracket that rotates about a pivot pin of the stationary bracket. A first link interconnects the rotary bracket and the hinge arm and a spindle is integrally connected to the rotary bracket. A controller receives driving information of the vehicle via an ADAS and adjusts a pop-up height of the hood when a collision is expected based on the received driving information.