Through-wall pipe sealing device capable of absorbing and expanding

The invention relates to the technical field of coal-fired power generation, in particular to a through-wall pipe sealing device capable of absorbing expansion, and aims to solve the problems of poor expansion and structural stress of a through-wall sealing device, prevention of boiler wall leakage and improvement of safety and reliability in operation of a boiler heating surface. According to the scheme, the water cooling wall is used for being arranged in the furnace wall to conduct cold water circulation so as to cool the furnace wall, the multiple through-wall pipes penetrate through the position, in the middle of the water cooling wall, of the furnace wall, each through-wall pipe is sleeved with one sleeve, the part, located below the water cooling wall, of each through-wall pipe is fixedly connected with one sleeve, and the multiple sleeves penetrate through one sealing flange plate and are fixedly connected with the sealing flange plate. According to the scheme, expansion displacement and structural st