Power station boiler top sealing device

The utility model relates to a power station boiler top sealing device. At present, tops of power station boilers in China have the problems of air leakage, ash leakage and smoke leakage to varying degrees, the positions of through-wall pipes are particularly serious, dust accumulation increases the load of steel frames and makes suspension rods be buried into ash, consequently, the suspension rods are seriously overheated, the temperature of the suspension rods exceeds a rated temperature, and safe operation of the boilers is under threat as time goes on. The power station boiler top sealing device comprises an aluminum silicate wool layer (3), three aluminum silicate felt layers (2) are arranged on the aluminum silicate wool layer, two aluminum silicate felt layers (4) are arranged under the aluminum silicate wool layer, an asbestos cement plaster layer (1) is arranged on the three aluminum silicate felt layers, a high-temperature daub layer (5) is arranged under the two aluminum silicate felt layers, a fire-resistant layer (7) is arranged under the high-temperature daub layer, and roof superheater pipes (6) are arranged under the fire-resistant layer.