A leaf spring type variable valve may include a housing wherein a hinge support part may be formed at a side thereof and an opening may be formed at another side thereof, a valve cover which may be rotatably secured to the hinge support part of the housing to thereby open or close the opening of the housing, and a leaf spring which may be interposed between a leaf spring support part fixedly secured to the hinge support part of the housing and the valve cover to thereby elastically pressurize the valve cover, wherein the leaf spring has an area in contact with the valve cover.