The invention discloses a platen superheater. The platen superheater comprises a superheater fixedly mounted on a steel frame; two L-shaped fixing rods are mounted on the steel frame; a fixing block is fixedly mounted on one ends of the two L-shaped fixing rods which are close to each other; a rotating shaft is fixedly mounted on the fixing block; a mounting block and fan blades are fixedly mounted on the rotating shaft; two rods are fixedly mounted on the side edges of the mounting block; high-temperature resistant rubber is fixed to each of the upper surfaces of the two rods; and the upper surfaces of the high-temperature resistant rubber are in contact with the lower surface of the superheater. The platen superheater has the advantages that solid particles adhered to the surface of thesuperheater are scraped by the rotating high-temperature resistant rubber, so that the accumulation of a large number of solid particles is effectively avoided, and the normal heat absorption of the superheater is ensured; and meanwhile, the rotation of the high-temperature resistant rubber can be realized by contacting with the flow of flue gas without an additional power source, so that the usecost is low, and the generated beneficial effect is obvious.