The utility model discloses a sewage pool sealing system. The sewage pool sealing system includes a sealing film body arranged at the top end of a sewage treatment pool, wherein the sealing film body includes a plurality of module films, and each module film includes a steel bracket and film materials fixed on the steel bracket. The sewage pool sealing system provided by the utility model has the benefits that the module films are assembled to form the sealing film body through the modular design of the sealing film body, so that the mounting and transportation difficulties of the sealing film body are greatly reduced; meanwhile, in case of partial damage of the sealing film body, the corresponding module film can be replaced directly, and entire replacement is not needed, which not only effectively facilitates the maintenance process, but also greatly reduces the repair cost.