An air freshener, comprising: a rotating box; a fixed base mounted on said rotating box; a perfume box filled with a perfume; and a fixing device, said rotating box consists of a front cover and a rear base, characterized in that said perfume being a liquid perfume; said rear base has a round groove for receiving a circular sheet of the fixed base such that the rotating box can rotate with respect to the fixed base, and one or more than one air hole is provided in said round groove, and said rotating box has an internal space for receiving and embedding said perfume box therein for rotating the perfume box together with the rotating box; said fixed base comprises the circular sheet which matches with the round groove of the rear base of said rotating box, one or more than one air hole on said circular sheet for exposing the perfume box when said rotating box is rotated with respect to the fixed base for adjusting the releasing area of perfume vapor, and a clipping groove which is provided on a back side of said fixed base for clipping said fixing device; said perfume box has a box body suction-molded from a plastics sheet and is embedded into a step of the rotating box and abuts against the step surface, such that the shape of the perfume box is adaptive to the rotating box so as to facilitate the perfume box to be embedded into the rotating box and to rotate together with the rotating box, a semi-permeable film which is sealed onto a plane of an edge of the box body for filling the liquid perfume inside the box body and preventing leak-out of perfume liquid and allowing diffuse-out of perfume vapor, and an airtight aluminum foil with a long tail which is laminated to the semi-permeable film for preventing diffuse-out of perfume vapor before use; and said fixing device comprises a fixing clip or a suction cup which can be clipped to the clipping groove of the fixed base for fixing the air freshener at a place to use the air freshener. a rotating box; a fixed base mounted on said rotating box; a perfume box filled with a perfume; and a fixing device, said rotating box consists of a front cover and a rear base, characterized in that said perfume being a liquid perfume; said rear base has a round groove for receiving a circular sheet of the fixed base such that the rotating box can rotate with respect to the fixed base, and one or more than one air hole is provided in said round groove, and said rotating box has an internal space for receiving and embedding said perfume box therein for rotating the perfume box together with the rotating box; said fixed base comprises the circular sheet which matches with the round groove of the rear base of said rotating box, one or more than one air hole on said circular sheet for exposing the perfume box when said rotating box is rotated with respect to the fixed base for adjusting the releasing area of perfume vapor, and a clipping groove which is provided on a back side of said fixed base for clipping said fixing device; said perfume box has a box body suction-molded from a plastics sheet and is embedded into a step of the rotating box and abuts against the step surface, such that the shape of the perfume box is adaptive to the rotating box so as to facilitate the perfume box to be embedded into the rotating box and to rotate together with the rotating box, a semi-permeable film which is sealed onto a plane of an edge of the box body for filling the liquid perfume inside the box body and preventing leak-out of perfume liquid and allowing diffuse-out of perfume vapor, and an airtight aluminum foil with a long tail which is laminated to the semi-permeable film for preventing diffuse-out of perfume vapor before use; and said fixing device comprises a fixing clip or a suction cup which can be clipped to the clipping groove of the fixed base for fixing the air freshener at a place to use the air freshener.