A tilting portable electronic device includes a housing, a cover, a sliding mechanism and a rotating member. The sliding mechanism includes a connecting plate and at least one elastic member, the connecting plate rotatably connects with the cover, the elastic member connects to the connecting plate and the housing, the rotating member rotatably connects to the cover and the housing. When the cover is pushed by a force, one end of the cover slides along the surface of the housing with the connecting plate; the rotating member rotates to support the other end of the cover, after the sliding plate sliding over a predetermined distance, the elastic member releases energy to drive the connecting plate sliding further automatically, and the cover opens tilted relative to the housing.