An intelligent parking method of an autonomous driving vehicle is provided. The intelligent parking method includes steps of: recommending a first parking location according to an acquired target location; constructing an observation area according to the first parking location; obtaining environmental data of the observation area when the autonomous driving vehicle reaches the observation area; determining whether the first parking location is available or not according to the environmental data of the observation area; driving to the first parking location to park when the first parking location is available; or acquiring a second parking location according to a predetermined evaluation rule when the first parking location is unavailable, and recommending the one or more second parking locations to the user for selection; and driving to the second parking location selected by the user to park.