The invention relates to a long-strip-shaped floating valve and belongs to the technical field of chemical equipment for gas-liquid mass transferring separation in a chemical industry. The long-strip-shaped floating valve comprises a quadrilateral valve cover and two valve legs, wherein the bottom of the valve cover is provided with a bulge with a high middle part and a low periphery; at least one tongue hole is formed in the valve cover; an inclined baffle is arranged on the tongue hole at the top of the valve cover; teeth are arranged at two opposite side edges of the valve cover; the valve legs are arranged at the parts, close to the other two side edges, of the bottom of the valve cover; the valve legs and the valve cover are vertically arranged; and valve feet are arranged at the lower ends of the valve legs. According to the long-strip-shaped floating valve provided by the invention, the vibration in a use process can be effectively reduced and the service life is prolonged.