Disclosed is a fixing structure for ventilator cover spring, comprising a fixing component, a connector, a movable part, and a cover spring. The fixing component is a U-shaped protrusion formed on a cover and has a top wall and two leg walls, a first opening and a second opening are respectively formed in the two leg walls. Two cuts are formed at two ends of the connector, wherein each cut is provided with a tongue, the connector being inserted through and fixed in the first opening and the second opening. The movable part has a head portion and a foot portion, wherein the head portion is fixed on the connector, and the foot portion extends toward the top wall. The cover spring is fitted over the foot portion and is confined on the foot portion.